13-letter words containing o, r, t, h, s, i
- morphometrics — a technique of taxonomic analysis using measurements of the form of organisms
- musicotherapy — the treatment of mental disorders with music
- mythographies — Plural form of mythography.
- nanochemistry — (chemistry) The synthesis, analysis and characterization of chemical compounds at the nanoscale.
- nephrectomies — Plural form of nephrectomy.
- nephropathies — Plural form of nephropathy.
- night terrors — a sudden feeling of extreme fear that awakens a sleeping person, usually during slow-wave sleep, and is not associated with a dream or nightmare.
- night-terrors — a sudden feeling of extreme fear that awakens a sleeping person, usually during slow-wave sleep, and is not associated with a dream or nightmare.
- nitrous ether — ethyl nitrite.
- non-christian — (of a person, country, etc) not adhering to the Christian faith
- nonhistorical — Not based on or drawn from history.
- nonhysterical — not hysterical or funny
- north ossetia — an autonomous republic in S European Russia, in the N Caucasus. 3100 sq. mi. (8029 sq. km) Capital: Vladikavkaz.
- north sea oil — oil extracted from deposits beneath the North Sea
- northerliness — The quality of being northerly.
- odontornithes — a proposed class of birds that possess teeth
- off the rails — into or in a state of dysfunction or disorder
- on the parish — receiving parochial relief
- 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
- 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.
- 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.
- 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.
- orthodontists — Plural form of orthodontist.
- orthogonalise — to make (vectors, functions, etc.) orthogonal.
- orthographies — Plural form of orthography.
- orthosilicate — a silicate mineral
- otherworldish — characterized by otherworldliness
- outside-right — a footballer who plays on the outside right wing of the field
- outstretching — Present participle of outstretch.
- over-shipment — an act or instance of shipping freight or cargo.
- overhastiness — the condition of being overhasty
- painted horse — paint (def 6).
- parthian shot — a sharp, telling remark, act, gesture, etc., made in departing.
- past historic — the simple past
- pathomorphism — abnormal morphology.
- petrophysical — relating to the analysis of the constitution and characteristics of rocks
- photo-sharing — the publishing of digital photographs on the internet
- photochromism — the reversible transformation of something's colour due to exposure to electromagnetic radiation such as sunlight
- photofinisher — a person whose profession is photofinishing
- photophoresis — the move away from a strong light source by previously suspended particles in a gas
- phraseologist — a person who treats of or is concerned with phraseology.
- physiotherapy — physical therapy.