15-letter words containing a, e, r, o, s, i
- transequatorial — of, relating to, or near an equator, especially the equator of the earth.
- transfer window — the period during the year in which a football club can transfer players from other teams into their own
- transgressional — of or relating to transgression
- transition team — a group of people who manage the transition between one system, administrative regime, etc and another
- transliteration — to change (letters, words, etc.) into corresponding characters of another alphabet or language: to transliterate the Greek Χ as ch.
- transmissometer — an instrument for measuring visibility or the transmission of light in the atmosphere.
- trapdoor spider — any of various, often large, spiders (esp. family Ctenizidae) that dig a burrow and cover the entrance with a hinged lid like a trapdoor
- treaty of paris — a treaty of 1763 signed by Britain, France, and Spain that ended their involvement in the Seven Years' War
- trojan asteroid — one of a number of asteroids that have the same mean motion and orbit as Jupiter, preceding or following the planet by a longitude of 60°
- trout fisherman — a fisherman who catches trout
- turbinate bones — the thin scroll-shaped bones situated on the walls of the nasal passages
- tutorial system — a system of education, especially in some colleges, in which instruction is given personally by tutors, who also act as general advisers of a small group of students in their charge.
- twist one's arm — to combine, as two or more strands or threads, by winding together; intertwine.
- ultra-modernist — very advanced in ideas, design, or techniques.
- ultra-religious — of, relating to, or concerned with religion: a religious holiday.
- ultramicroscope — an instrument that uses scattering phenomena to detect the position of objects too small to be seen by an ordinary microscope.
- un-considerable — rather large or great in size, distance, extent, etc.: It cost a considerable amount. We took a considerable length of time to decide.
- uncompromisable — that cannot or should not be compromised
- unconstrainable — unable to be confined
- unconstrainedly — in an unconfined manner
- uncontroversial — of, relating to, or characteristic of controversy, or prolonged public dispute, debate, or contention; polemical: a controversial book.
- undemonstrative — not given to open exhibition or expression of emotion, especially of affection.
- underestimation — to estimate at too low a value, rate, or the like.
- universal donor — a person with blood of group O.
- universal joint — piece that couples two rotating shafts
- universal motor — a series-wound motor, of one-half horsepower or less, using alternating or direct current.
- unprotestantize — to make something (e.g. a church, country, etc) a religion other than Protestant
- unseaworthiness — constructed, outfitted, manned, and in all respects fitted for a voyage at sea.
- unskilled labor — work that requires practically no training or experience for its adequate or competent performance.
- unsportsmanlike — a man who engages in sports, especially in some open-air sport, as hunting, fishing, racing, etc.
- vacation course — a course of study undertaken during a vacation, usually combined with other activities
- vector analysis — the branch of calculus that deals with vectors and processes involving vectors.
- venus hairstone — a variety of rutilated quartz, used as a gemstone.
- vermouth cassis — a mixed drink made with dry vermouth, crème de cassis, soda or mineral water, and cracked ice.
- vernier compass — a compass on a transit (vernier transit) having a vernier for adjusting magnetic bearings to read as true bearings.
- villeda morales — Ramón [rah-mawn] /rɑˈmɔn/ (Show IPA), 1909?–71, Honduran diplomat and statesman: president 1957–63.
- virtual storage — a system whereby addressable memory is extended beyond main storage through the use of secondary storage managed by system software in such a way that programs can treat all of the designated storage as addressable main storage.
- vitreous silica — silica glass
- voyeuristically — of, relating to, or characteristic of a voyeur or of voyeurism.
- weapons carrier — a light truck for transporting weapons or munitions in the field.
- weather station — an installation equipped and used for meteorological observation.
- white cast iron — cast iron having most or all of its carbon in the form of cementite and exhibiting a silvery fracture.
- white snakeroot — a North American plant, Eupatorium urticaefolium, the roots or rhizomes of which have been used as a remedy for snakebite
- wilderness road — a 300-mile (500-km) route from eastern Virginia through the Cumberland Gap into Kentucky, explored by Daniel Boone in 1769 and marked as a trail by him and other pioneers in 1775: a major route for early settlers moving west.
- winter holidays — a period of rest from work or studies taken in winter
- wolverine state — Michigan (used as a nickname).
- worcester china — porcelain articles made in Worcester (England) from 1751 in a factory that became, in 1862, the Royal Worcester Porcelain Company
- working storage — the amount of memory used to temporarily store results or other data while a program is running.
- yorke peninsula — a peninsula in S Australia between Spencer Gulf and the Gulf of St. Vincent. 160 miles (257 km) long and 20–35 miles (32–56 km) wide.
- yorkshire chair — Derbyshire chair.