12-letter words containing o, a, t, h

old faithful — one of the best known geysers of Yellowstone National Park.
oligochaetes — Plural form of oligochaete.
on the alert — fully aware and attentive; wide-awake; keen: an alert mind.
on the brain — constantly in mind
on the cadge — engaged in cadging
on the cards — likely
on the cheap — costing very little; relatively low in price; inexpensive: a cheap dress.
on the latch — fastened by the latch (sense 1) but not locked or bolted
on the march — If a group of soldiers are on the march, they are marching somewhere.
on the panel — receiving sickness benefit, esp from the government
on the slate — on credit
on the table — an article of furniture consisting of a flat, slablike top supported on one or more legs or other supports: a kitchen table; an operating table; a pool table.
on the wagon — any of various kinds of four-wheeled vehicles designed to be pulled or having its own motor and ranging from a child's toy to a commercial vehicle for the transport of heavy loads, delivery, etc.
on the watch — to be alertly on the lookout, look attentively, or observe, as to see what comes, is done, or happens: to watch while an experiment is performed.
one-base hit — single (def 24).
oneg shabbat — a Jewish celebration in honor of the Sabbath that takes place on Friday evening or Saturday afternoon and usually includes a program of songs, a lecture, and refreshments.
only have to — If you say you only have to do one thing in order to achieve or prove a second thing, you are emphasizing how easily the second thing can be achieved or proved.
ooze leather — leather prepared from calfskin or other skin and having a soft, velvety finish on the flesh side.
open slather — to spread or apply thickly: to slather butter on toast.
open-hearted — unreserved, candid, or frank: open-hearted advice.
operatorship — (in the oil and gas industries) the right to operate a well, field, or other oil source.
ophiolatrous — of, relating to, or practising snake-worshipping
ophthalmitis — ophthalmia.
ophthamology — Misspelling of ophthalmology.
opisthograph — a manuscript, parchment, or book having writing on both sides of the leaves.
opthalmology — Misspelling of ophthalmology.
optic chiasm — a site at the base of the forebrain where the inner half of the fibers of the left and right optic nerves cross to the opposite side of the brain.
optical path — the path of light through a medium, having a magnitude equal to the geometric distance through the system times the index of refraction of the medium.
oral history — information of historical or sociological importance obtained usually by tape-recorded interviews with persons whose experiences and memories are representative or whose lives have been of special significance.
orchestrally — In an orchestral manner.
orchestrated — Simple past tense and past participle of orchestrate.
orchestrates — Third-person singular simple present indicative form of orchestrate.
orchestrator — One who orchestrates.
ornithogalum — any plant of the genus Ornithogalum
ornithomancy — Divination by means of birds, their flight, etc.
orthoclastic — (of a crystal) having cleavages at right angles to each other.
orthoformate — an ester of orthoformic acid.
orthognathic — straight-jawed; having the profile of the face vertical or nearly so; having a gnathic index below 98.
orthogonally — Mathematics. Also, orthographic. pertaining to or involving right angles or perpendiculars: an orthogonal projection. (of a system of real functions) defined so that the integral of the product of any two different functions is zero. (of a system of complex functions) defined so that the integral of the product of a function times the complex conjugate of any other function equals zero. (of two vectors) having an inner product equal to zero. (of a linear transformation) defined so that the length of a vector under the transformation equals the length of the original vector. (of a square matrix) defined so that its product with its transpose results in the identity matrix.
orthographer — a person versed in orthography or spelling.
orthographic — of or relating to orthography.
orthopaedics — (used with a singular verb) the medical specialty concerned with correction of deformities or functional impairments of the skeletal system, especially the extremities and the spine, and associated structures, as muscles and ligaments.
orthopaedist — Alternative spelling of orthopedist.
orthopedical — (American spelling) Alternative form of orthopaedical.
orthopterans — Plural form of orthopteran.
orthovanadic — relating to orthovanadates
out of a hat — as if by magic
out of phase — in an unsynchronized way
out of reach — beyond arm's length
out of shape — person: unfit

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