13-letter words containing s, t, o, p, i
- topochemistry — the study of reactions that only occur at specific regions in a system
- topoisomerase — any of a class of enzymes that control the coiling of DNA molecules
- torsion group — a group in which every element has finite order.
- total eclipse — an eclipse in which the surface of the eclipsed body is completely obscured.
- total impulse — a measure of the maximum momentum that a given reaction engine and fuel supply can impart to a vehicle.
- township line — Surveying. one of two parallel lines running east and west that define the north and south borders of a township. Compare range line, township (def 2).
- toxicophagous — poison-eating
- toxoplasmosis — infection with the parasite Toxoplasma gondii, transmitted to humans by consumption of insufficiently cooked meat containing the parasite or by contact with contaminated cats or their feces: the illness produced is usually mild, but in pregnant women may damage the fetus.
- train spotter — a person who collects the numbers of railway locomotives
- trainspotting — hobby: observing trains
- transcription — the act or process of transcribing.
- transcriptome — a collection of all the messenger RNA in a particular cell
- transpiration — an action or instance of transpiring.
- transposition — an act of transposing.
- treponemiasis — infection with treponema; syphilis.
- trichopterist — a student of, or expert in, trichopteran insects
- trichopterous — belonging or pertaining to the insect order Trichoptera, comprising the caddisflies.
- triploblastic — having three primary germ layers, as the embryos of vertebrates.
- trophotropism — the response by an organism or cell to, or the movement of an organism or cell towards or away from, an external source of nutrition
- tropical fish — any of numerous small, usually brightly colored fishes, indigenous to the tropics, and often kept and bred in home aquariums.
- turkish pound — the Turkish lira.
- uncomplaisant — not eager to please; not compliant or obliging
- unpretentious — not pretentious; modest; without ostentatious display; plain: his unpretentious demeanor; an unpretentious summer resort.
- uprighteously — in an upright or moral manner
- vapor tension — vapor pressure.
- vino de pasto — a pale, dry sherry of Spain.
- visceroptosis — a downward displacement of the intestine
- volute spring — a coil spring, conical in shape, extending in the direction of the axis of the coil.
- walter piston — Walter, 1894–1976, U.S. composer.
- watering spot — watering hole
- waterscorpion — any of several predaceous aquatic bugs of the family Nepidae, having clasping front legs and a long respiratory tube at the rear of the abdomen: capable of biting if handled.
- whipping post — a post to which persons are tied to undergo whipping as a legal penalty.
- winter sports — Winter sports are sports that take place on ice or snow, for example skating and skiing.
- worker-priest — (in France) a Roman Catholic priest who, in addition to his priestly duties, works part-time in a secular job.
- xiphiplastron — the fourth lateral plate of a turtle's plastron
- zinjanthropus — the genus to which Australopithecus boisei was formerly assigned.