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

oil hardening — to quench (steel) in a bath of oil.
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 every hand — on all sides; in all directions
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.
onychophorans — Plural form of onychophoran.
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
orange roughy — a marine food fish, Hoplosthenus atlanticus, of S Pacific waters
orange squash — an orange-flavoured drink made from fruit juice, sugar, and water
orchard grass — a weedy grass, Dactylis glomerata, often grown for pastures.
orchard valve — an alfalfa valve of lesser diameter than the pipe it closes.
orchesography — a written study of dancing
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.
orchid family — the plant family Orchidaceae, characterized by terrestrial or epiphytic herbaceous plants having simple, parallel-veined, usually alternate leaves, complex and often large and showy flowers pollinated primarily by insects, and fruit in the form of a capsule containing numerous minute seeds, and including calypso, fringed orchis, lady's-slipper, pogonia, rattlesnake plantain, vanilla, as well as numerous tropical orchids such as those of the genera Cattleya, Cymbidium, Dendrobium, Phalaenopsis, and Vanda.
orchidomaniac — a person who is obsessed with or has a passion for orchids
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.
ornithischian — any herbivorous dinosaur of the order Ornithischia, having a pelvis resembling that of a bird. Compare saurischian.
ornithomantic — relating to ornithomancy
ornithophobia — Fear of birds.
oropharyngeal — the part of the pharynx between the soft palate and the upper edge of the epiglottis.
orthocephalic — having a medium or intermediate relation between the height of the skull and the breadth or length.
orthodiagonal — the axis in a crystal
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.
orthopaedical — Pertaining to orthopaedics; characteristic of orthopaedia.
orthopinakoid — a crystalline plane
orthosilicate — a silicate mineral
oscillographs — Plural form of oscillograph.
oscillography — a device for recording the wave-forms of changing currents, voltages, or any other quantity that can be translated into electric energy, as sound waves.
ostreophagous — oyster-eating
out of breath — the air inhaled and exhaled in respiration.
outreach work — work (done by welfare workers, volunteers, etc) designed to help and encourage disadvantaged members of the community

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