12-letter words containing i, a, t, r
- air mattress — an inflatable mattress or pad, as of plastic or rubber, used for camping, as an extra bed, etc.
- air ministry — (in England) the department of government administering all civil and military matters concerning aviation.
- air terminal — An air terminal is a building in which passengers wait before they get on to an aeroplane.
- air-breather — an aircraft, missile, or submarine engine that requires air from the atmosphere for the combustion of its fuel.
- airbrush out — to remove evidence of (someone or something from photographs, books, or history)
- aircraftsman — a person holding the rank of noncommissioned officer in the RAF.
- airfreighted — Simple past tense and past participle of airfreight.
- airport code — a three-letter abbreviation of the names of the world's major airports, used especially as an identifier for routing baggage.
- airtightness — the quality of being airtight
- alberti bass — a reiterated broken-chord figure used as an accompaniment, especially in 18th-century rococo keyboard music.
- alcaptonuria — Alternative spelling of alkaptonuria.
- algesiometer — an instrument for determining the sensitiveness of the skin to a painful stimulus.
- alkalimeters — Plural form of alkalimeter.
- alkaptonuria — excessive excretion of homogentisic acid in the urine, caused by a hereditary abnormality of the metabolism of tyrosine and phenylalanine.
- allegoristic — writing or using allegory; interpreting in an allegorical sense.
- alliteration — Alliteration is the use in speech or writing of several words close together which all begin with the same letter or sound.
- alliterative — Alliterative means relating to or connected with alliteration.
- allotropical — (chemistry, rare) Of or pertaining to an element that exhibits allotropy.
- alphabetiser — Non-Oxford British standard spelling of alphabetizer.
- alphabetizer — to put or arrange in alphabetical order.
- alstroemeria — any plant of the tuberous perennial liliaceous genus Alstroemeria, originally S American, grown for their brightly coloured orchid-like flowers
- alterability — capable of being altered.
- altercations — Plural form of altercation.
- alternations — Plural form of alternation.
- alternatives — a choice limited to one of two or more possibilities, as of things, propositions, or courses of action, the selection of which precludes any other possibility: You have the alternative of riding or walking.
- alto-relievo — high relief
- alto-rilievo — alto-relievo
- amateurishly — In an amateurish or nonprofessional manner.
- ambartsumian — Viktor A(mazaspovich). 1908–96, Armenian astrophysicist, renowned for his description of radio sources as explosions in the core of galaxies
- ambidextrous — Someone who is ambidextrous can use both their right hand and their left hand equally skilfully.
- ambisextrous — Informal. sexually attracted to both sexes; bisexual. used by or suitable for either sex; unisex: ambisextrous hair styles.
- ambisinister — clumsy or unskillful with both hands.
- ambrettolide — a colorless liquid, C 16 H 28 O 2 , having a strong musky odor, used as a fixative in the manufacture of perfume.
- ambulatories — Plural form of ambulatory.
- ambulatorily — By or in terms of walking.
- ameliorating — Present participle of ameliorate.
- amelioration — the act or an instance of ameliorating or the state of being ameliorated
- ameliorative — Able to repair or ameliorate.
- amelioratory — tending to ameliorate
- amentiferous — bearing aments
- amethopterin — (now rare) Methotrexate.
- aminobutyric — (organic chemistry) Of or pertaining to any of several isomeric univalent radicals in which a hydrogen atom of a butyric radical is replaced by an amino group.
- amor patriae — love of one's country; patriotism
- amortisation — Alternative spelling of amortization.
- amortization — the process of amortizing a debt
- amortizement — a sloping top on a buttress, pillar, etc.
- amperometric — relating to or involving the measurement of an electric current
- amphitheater — An amphitheater is a large open area surrounded by rows of seats sloping upward. Amphitheaters were built mainly in Greek and Roman times for the performance of plays.
- amphitheatre — An amphitheatre is a large open area surrounded by rows of seats sloping upwards. Amphitheatres were built mainly in Greek and Roman times for the performance of plays.
- amphitropous — (of a plant ovule) partially inverted so that the base and the micropyle at the apex are the same distance from the funicle