12-letter words containing a, d, r, o
- amygdaliform — almond-shaped.
- anaphrodisia — diminished sexual desire.
- and so forth — and so on; and other such things; et cetera
- andragogical — the methods or techniques used to teach adults: Many educators believe that the principles of andragogy, as advanced by Malcolm Knowles, have great relevance to adult education; others are not so certain.
- androcentric — having or regarding man or the male sex as central or primary
- androclinium — clinandrium.
- androgenesis — a type of reproduction in insects and plants involving the development of an embryo that contains only paternal chromosomes
- androgenetic — related to androgenesis
- androgenized — Simple past tense and past participle of androgenize.
- androscoggin — a river flowing from NE New Hampshire through SW Maine into the Kennebec River. 171 miles (275 km) long.
- androsterone — an androgenic steroid hormone produced in the testes. Formula: C19H30O2
- antherozooid — Alternative form of antherozoid.
- anthropodicy — An attempt, or argument attempting, to justify the existence of humanity as good (contrast theodicy).
- anthropoidal — Anthropoid.
- antiandrogen — (steroid, pharmacology) Any substance that inhibits the release or the biological effects of an androgen.
- antideuteron — the antimatter counterpart to the deuteron.
- antihydrogen — hydrogen in which the nucleus is an antiproton with an orbiting positron
- antiperiodic — efficacious against recurring attacks of a disease
- antipredator — discouraging or protecting against predators
- aperiodicity — not periodic; irregular.
- aphrodisiacs — Plural form of aphrodisiac.
- apostle bird — a gregarious grey-and-brown Australian nest-building bird, Struthidea cinerea
- appropriated — suitable or fitting for a particular purpose, person, occasion, etc.: an appropriate example; an appropriate dress.
- approximated — near or approaching a certain state, condition, goal, or standard.
- archdeaconry — the office, rank, or duties of an archdeacon
- archdiocesan — Relating to an archdiocese.
- archdioceses — Plural form of archdiocese.
- arfvedsonite — a type of hornblende with the composition Na3(Fe,Mg)4FeSi8O22(OH)2
- aria da capo — an operatic aria in three sections with the first and third sections alike and the middle section contrasting.
- armed forces — The armed forces or the armed services of a country are its military forces, usually the army, navy, marines, and air force.
- armor-plated — An armor-plated vehicle or building has a hard metal covering in order to protect it from gunfire and other missiles.
- armored rope — rope made of wire-wrapped hempen strands that is used in salvage work.
- armoured car — a fast lightly armed and armoured vehicle, mainly used for reconnaissance
- around about — Around about means approximately.
- art director — a person responsible for the sets and costumes in a film
- artiodactyle — (zoology) One of the Artiodactyla, a group of ungulates.
- artiodactyls — Plural form of artiodactyl.
- ash-coloured — silver-grey in colour
- assortedness — the position of being sorted, grouped or harmonized with, well or badly, or provided with a good or bad assortment or mixture
- astrodynamic — Pertaining to astrodynamics.
- auctioneered — Simple past tense and past participle of auctioneer.
- auditorially — Anatomy, Physiology. pertaining to hearing, to the sense of hearing, or to the organs of hearing.
- autodestruct — likely to or possessing the power to destroy or obliterate itself or its possessor
- autodiallers — Plural form of autodialler.
- bachelor pad — a flat in which a bachelor lives
- bachelorhood — the state of being a bachelor.
- backgrounded — Simple past tense and past participle of background.
- backgrounder — A backgrounder is a short article in a newspaper or magazine that provides background information about a particular subject.
- backswordman — a person who uses a backsword.
- bacteriocide — Alternative form of bactericide.