13-letter words containing t, h, o, r

old northwest — a territory of Canada lying N of 60 degrees N and extending E from the Yukon Territory to Nunavut. 519,732 sq. mi. (1,346,106 sq. km) Capital: Yellowknife.
on a par with — If you say that two people or things are on a par with each other, you mean that they are equally good or bad, or equally important.
on the carpet — a heavy fabric, commonly of wool or nylon, for covering floors.
on the market — an open place or a covered building where buyers and sellers convene for the sale of goods; a marketplace: a farmers' market.
on the parish — receiving parochial relief
on the razzle — out enjoying oneself or celebrating, esp while drinking freely
on the square — a rectangle having all four sides of equal length.
on the street — a public thoroughfare, usually paved, in a village, town, or city, including the sidewalk or sidewalks.
on the throne — monarch: in power
on-the-record — on-record.
open brethren — one of the two main divisions of the Plymouth Brethren that, in contrast to the Exclusive Brethren, permits contacts with members outside the sect
openheartedly — Alt form open-heartedly.
opisthobranch — any gastropod mollusk of the order Opisthobranchia, as the sea slugs, sea butterflies, and sea hares, characterized by a vestigial or absent mantle and shell and two pairs of tentacles.
opisthography — the practice of writing on the front and back of a parchment or papyrus
oprahfication — the perceived increase in people’s desire to discuss their emotions or personal problems, attributed to the influence of confessional television programmes
orchestra pit — musicians' seating in front of stage
orchestra-pit — a group of performers on various musical instruments, including especially stringed instruments of the viol class, clarinets and flutes, cornets and trombones, drums, and cymbals, for playing music, as symphonies, operas, popular music, or other compositions.
orchestralist — a person who writes or arranges orchestral music
orchestrating — Present participle of orchestrate.
orchestration — (uncountable) the arrangement of music for performance by an orchestra.
orchestrators — Plural form of orchestrator.
orchidologist — someone who is knowledgeable in orchidology
orchiectomies — Plural form of orchiectomy.
organ whistle — a steam or air whistle in which the jet is forced up against the thin edge of a pipe closed at the top.
organolithium — (organic chemistry) Describing any organic compound containing a carbon to lithium bond.
organotherapy — the branch of therapeutics that deals with the use of remedies prepared from the organs of animals, as from the thyroid gland, the pancreas, or the suprarenal bodies.
ornithichnite — (paleontology) The footmark of a bird occurring in strata of stone.
ornithischian — any herbivorous dinosaur of the order Ornithischia, having a pelvis resembling that of a bird. Compare saurischian.
ornithologist — the branch of zoology that deals with birds.
ornithomantic — relating to ornithomancy
ornithophobia — Fear of birds.
orthocephalic — having a medium or intermediate relation between the height of the skull and the breadth or length.
orthodiagonal — the axis in a crystal
orthodontists — Plural form of orthodontist.
orthoepically — In terms of correct pronunciation.
orthognathous — straight-jawed; having the profile of the face vertical or nearly so; having a gnathic index below 98.
orthogonalise — to make (vectors, functions, etc.) orthogonal.
orthogonality — (mathematics, statistics) the property of being orthogonal.
orthogonalize — to make (vectors, functions, etc.) orthogonal.
orthographies — Plural form of orthography.
orthographize — to spell correctly or according to the rules of orthography.
orthohydrogen — the form of molecular hydrogen in which the nuclei of the two hydrogen atoms contained in the molecule have spins in the same direction.
orthopaedical — Pertaining to orthopaedics; characteristic of orthopaedia.
orthopinakoid — a crystalline plane
orthopyroxene — a member of the pyroxene group of minerals having an orthorhombic crystal structure, such as enstatite and hypersthene
orthosilicate — a silicate mineral
ostreophagous — oyster-eating
otherworldish — characterized by otherworldliness
out of breath — the air inhaled and exhaled in respiration.
out of humour — in a bad mood

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