13-letter words containing t, h, e, r, o
- 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.
- 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.
- orthocephalic — having a medium or intermediate relation between the height of the skull and the breadth or length.
- orthoepically — In terms of correct pronunciation.
- orthogonalise — to make (vectors, functions, etc.) 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.
- 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.
- outreach work — work (done by welfare workers, volunteers, etc) designed to help and encourage disadvantaged members of the community
- outside-right — a footballer who plays on the outside right wing of the field
- outstretching — Present participle of outstretch.
- over the hill — a natural elevation of the earth's surface, smaller than a mountain.
- over the hump — a rounded protuberance, especially a fleshy protuberance on the back, as that due to abnormal curvature of the spine in humans, or that normally present in certain animals, as the camel or bison.
- over the moon — extremely joyful
- over the odds — more than is expected, necessary, etc
- over-shipment — an act or instance of shipping freight or cargo.
- over-the-road — of, for, or pertaining to transportation on public highways: over-the-road trucks.
- over-vehement — characterized by rancor or anger; violent: vehement hostility.
- overbreathing — hyperventilation
- overhand knot — a simple knot of various uses that slips easily.
- overhastiness — the condition of being overhasty
- overhead-shot — over one's head; aloft; up in the air or sky, especially near the zenith: There was a cloud overhead.
- overnight bag — a travel bag large enough to hold personal articles and clothing for an overnight trip.
- overstretched — to stretch excessively.
- oxford theory — the theory attributing the authorship of Shakespeare's plays to Edward de Vere, Earl of Oxford, 1550–1604.
- oystercatcher — any of several long-billed wading birds of the genus Haematopus that have chiefly black-and-white plumage and that feed on oysters, clams, mussels, etc.
- painted horse — paint (def 6).
- parasyntheton — a word formed by parasynthesis; for example, kind-hearted
- parental home — a school for problem children.
- parnell shout — a social occasion where each person in a group pays for his or her own entertainment or meal
- parthenocarpy — the production of fruit without fertilization of an egg in the ovary.
- parthenopaeus — a son of Hippomenes and Atalanta, and one of the Seven against Thebes.
- parthenospore — a spore developed without fertilization.
- pass the word — If you pass the word, you tell someone something that another person has told you.
- patent holder — a person or company that holds a patent
- peppered moth — a European geometrid moth, Biston betularia, occurring in a pale grey speckled form in rural areas and a black form in industrial regions
- perchlorinate — to combine with the maximum proportion of chlorine.
- petrochemical — a chemical substance obtained from petroleum or natural gas, as gasoline, kerosene, or petrolatum.
- petrophysical — relating to the analysis of the constitution and characteristics of rocks
- phallocentric — a doctrine or belief centered on the phallus, especially a belief in the superiority of the male sex.
- pharyngectomy — excision of part or all of the pharynx.
- phenobarbital — a white, crystalline powder, C 1 2 H 1 2 N 2 O 3 , used as a sedative, a hypnotic, and as an antispasmodic in epilepsy.