12-Letter Words Starting with O

""OBDURATE to become hard-hearted, also OBDURE""

Obfuscation

Objectify

Objectivism

Objectivist

Objurgation

""Lanceolate in the reversed order, that is, narrowing toward the point of attachment more than toward the apex.""

Oblateness

In an obligatory manner; by reason of obligation.

Erasing

Fantastic lob before repeat loss

The removal of oil to Iran - bet it goes astray!

Utter destruction

Tending or serving to obliterate.

Obliterator

OBNUBILATE To cloud; to obscure.

Clouding stink over knight with general rejoicing losing head

For this custom, brain's abandoned

One who makes dim, daft subtractions

Wrong subtractions standing in the way of enlightenment

Resisting enlightenment, having messed up subtractions

Obscuration

Roughly Sobers admits VAT is charged for examinations

Measurements from an experiment soon vibrates all over the place

""The state of being obsolete, or no longer used; a state of desuetude.""

Childbirth doctor

Medical specialist - is certain to get involved around start of birth (wordplay)

Expert with children, i.e. Scot involved with bairn taking temperature

Drunken bore's posture becomes unruly

Sober posture (anagram) - unruly

Noisy, hard to control

Hindrances

Noisy disturbances on street after outside broadcast means barriers

Obstructive

Obtuseness

Occidental

Occultation

Relating to one's job or profession

Rehabilitation via practical activities

To do with work

One whose main interest is scientific

Sea scientist

Scientist involved with study of the seas

Octahedral

Octapeptide

Old man's gone out with raincoat

Robert Frost, for example.

Veteran's gone out in shabby raincoat

Also octosyllabic ( k t -s -l b k) a. A line of verse containing eight syllables.

Octosyllabic.

Odontoblast

Officiation

An apparatus for measuring the acuity of the sense of smell.

Oligochaete

Lacking in plant nutrients and having a large amount of dissolved oxygen throughout. Used of a pond or lake.

Omnipotence

With all-encompassing power

Omniscient

ONCOGENIC

English word

Formation of words from natural sounds.

Cuckoo or "whippoorwill," for example

Formation of words like "buzz" or "hiss"

Sounding like its meaning

Pl. oophorectomies Surgical removal of one or both ovaries. Also called ovariectomy .

Opalescent

OPERATIC the technique of staging operas

""OPERATION The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.""

""OPERATION The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.""

OPERATOR one that {operates=v}

Unduly attached to one's own opinions; opinionated.

Opportunism

They make the best of what happens to awful sprouts in pot

They make the best of what happens to wild sprouts in pot

The condition or quality of being opposable.

The quality or state of being opposite.

""OPPOSITION The act of opposing; an attempt to check, restrain, or defeat; resistance.""

Optimality

""OPTIMISE to make as effective as possible, also OPTIMIZE""

""OPTIMIZE to make as effective as possible, also OPTIMISE""

Optometrist

Oratorical

Orchestral

Gold casket marked and scored

Arranged to have the dart score put out

Arranged for gold casket getting evaluated

ORCHESTRATE to write an orchestra score for; -- of a musical composition.

Arranges music

Narrow passages for killer whales (wordplay)

Or that scorer, perhaps (wordplay)

Speaker reserves royal box for arranger

Speaker keeps royal box for the organiser

Organicity

Firm with The Irish Times, for one

Running over before Saigon train's off

Company talk about fantastic gains

""The act of organizing; the act of arranging in a systematic way for use or action; as, the organization of an army, or of a deliberative body. as, the organization of an army, or of a deliberative body.""

""Making an impression upon an organ; plastic; said of the effect or impression produced by any substance on the organs of touch, taste, or smell, and also on the organism as a whole.""

Orientalism

Orientalist

ORIENTALIZE to render Oriental; to cause to conform to Oriental manners or conditions.

Orientalize

Orientation

Sport involving maps and compasses

Sport using map and compass

Origination

By way of ornament.

Ornateness

The branch of zoology that deals with the study of birds.

Ornithopter

Orotundity

Orthocenter

Orthodontia

Canine training (wordplay)

Correction of dental irregularities

Branch of dentistry

Professional who may say, "Hold still!"

Professional who may say, 'Hold still!'

... "Get to the chopper!"

Plural or third person singular

""Biology progressive evolution, leading to the development of a new form, as can be seen through successive generations. See also society . ; orthogenetic , adj . Evolution the sociological theory that all cultures or societies follow the same fixed course of determinate evolution. See also evolution . ; orthogenetic,""

""Biology progressive evolution, leading to the development of a new form, as can be seen through successive generations. See also society . ; orthogenetic , adj . Evolution the sociological theory that all cultures or societies follow the same fixed course of determinate evolution. See also evolution . ; orthogenetic,""

""Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally. as, a curve cuts a set of curves orthogonally.""

""ORTHOGRAPH An orthographic projection, sometimes partly in section, esp. of a building.""

The treatment of bone and muscle disorders

Rum do, as her topic is a medical speciality

Orthopedist

Orthopteran

Inflected form of ORTHOPTER Inflected form of ORTHO short for orthochromatic plate (a photographic plate)

Orthopter

Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization. Crystallization.

Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous.

Devious colonialists making waves

Osmolality

Osmolarity

Action is so, if developing then hardening

Ostentation

Given to showy display

Gaudy and garish

Showy and vulgar

""OSTEOBLAST One of the protoplasmic cells which occur in the osteogenetic layer of the periosteum, and from or around which the matrix of the bone is developed; an osteoplast.""

OSTEOCLAST A myeloplax.

OSTEOGEN a substance from which bone is formed

OSTEOGEN a substance from which bone is formed

Of or pertaining to osteology.

Osteologist

""A disease of the bones, in which they lose their earthy material, and become soft, flexible, and distorted. Also called malacia. malacia.""

Osteopathy

""Producing bone; as, osteoplastic cells. as, osteoplastic cells.""

""Pl. osteoporoses (-s z) A disease in which the bones become extremely porous, are subject to fracture, and heal slowly, occurring especially in women following menopause and often leading to curvature of the spine from vertebral collapse.""

Brittle bones condition

Oops, Tories so affected by bodily weakness!

Bone deficiency

""Pl. osteoporoses (-s z) A disease in which the bones become extremely porous, are subject to fracture, and heal slowly, occurring especially in women following menopause and often leading to curvature of the spine from vertebral collapse.""

A tumor having the structure of a sacroma in which there is a deposit of bone; sarcoma connected with bone.

Ostracoderm

Out of touch with reality

Relating to an imaginary realm

Spiritual; imaginary

Otioseness

Plural or third person singular

""A disease of the ear in which the movement of the stapes within the oval window becomes impeded by abnormal deposits of spongy bone, leading to a progressive loss of hearing.""

OUTACHIEVE

OUTBALANCE To outweight; to exceed in weight or effect.

Outbargain

Outbreeding

Sheds what's not popular in the architects plans

Sheds what's not popular from groundbreaking developments

Outcavil

OUTCOMPETE

Outcropping

OUTDATED outdate

Outdeliver

Outdesign

Left (a competitor) far behind

Leaves behind.

Excelled in military skill

Outglitter

OUTGOING expenditure

OUTINTRIGUE

Outintrigue

In a bizarre way

Oddly - and in a foreign manner

Expense includes new food left in an odd way

Outmaneuver

Outnumber

OUTORGANIZE

Outorganize

Outperform

""The process of facilitating a terminated employee's search for a new job by provision of professional services, such as counseling, paid for by the former employer.""

Outpolitick

OUTPOPULATE

Outpopulate

Outpreach

OUTPRODUCE

OUTPROMISE

In a shockingly bad manner

Outrebound

Word with prefix out-

Outrival

OUTSIDER one who does not belong to a particular group

Outsourcing

OUTSPARKLE To exceed in sparkling.

Extending broadly

Outsprint

(Of arms) extended

Poor tutors and the like he had extended

Fashion etc, the Tudors extended

Outstretch

Outstrip

Outthrob

OUTWRESTLE

Ovariotomy

ABSTRACT to draw away

Way, way, way too prevalent

On a roll, Dutch worker produces too much

ACTIVITY the state of being active

Overassert

More than is required for six deliveries (wordplay)

Problem with space? Ring father going back to room for everybody!

Overcasting

Overcaution

A curious vote, sadly going for the ultra-safe option (wordplay)

Overcontrol

Overcorrect

Overcount

A civil rector sadly becoming too judgmental

Casanova loses the head with serious type that's hard to please

DECORATE to {adorn=v}

Overdirect

DISCOUNT to reduce the price of

DOCUMENT to support by conclusive information

DOMINANT a controlling genetic character

DRAMATIC pertaining to {drama=n}

EDUCATED educate

Overeducate

Excessively emphatic.

Take too seriously.

Rate too highly

Value too highly

Virgin provided with Exocet is bad for blood pressure

Overexert

More than enough effort is a strain

Excess of effort

The use of too much effort

EXPLICIT conclusion or last words in a book

Overexploit

Overextend

FATIGUED fatigue

Overfatigue