12-letter words containing a, c, i, d
- agriproducts — Plural form of agriproduct.
- aid climbing — climbing that employs mechanical devices (aids) to accomplish difficult manoeuvres (artificial moves)
- aide-de-camp — An aide-de-camp is an officer in the armed forces who helps an officer of higher rank.
- air corridor — an air route along which aircraft are allowed to fly
- air cylinder — a cylinder containing air, esp one fitted with a piston and used for damping purposes
- airport code — a three-letter abbreviation of the names of the world's major airports, used especially as an identifier for routing baggage.
- alginic acid — powdery substance extracted from kelp
- alias dictus — otherwise called; alias.
- ambitendency — ambivalence, especially when acted out; a tendency to contradictory behavior arising from conflicting impulses.
- americanized — If someone is Americanized, they do things in a way that is typical of the United States.
- anapodeictic — (rare, rhetoric) not able to be shown or proved by argument; undemonstrable.
- and counting — If you say and counting after a number or an amount of something, you mean that the number or amount is continuing to increase.
- 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.
- androgenetic — related to androgenesis
- androscoggin — a river flowing from NE New Hampshire through SW Maine into the Kennebec River. 171 miles (275 km) long.
- anecdotalism — an inclination to relate anecdotes
- anthropodicy — An attempt, or argument attempting, to justify the existence of humanity as good (contrast theodicy).
- anti-radical — opposed to radicalism or radicals.
- antiacademic — opposed to education
- anticathodes — Plural form of anticathode.
- antidiabetic — a drug which acts against diabetes
- antidiuretic — (of a hormone, treatment, etc) acting on the kidneys to control water excretion
- antidogmatic — opposed to dogma
- antiperiodic — efficacious against recurring attacks of a disease
- aperiodicity — not periodic; irregular.
- aphrodisiacs — Plural form of aphrodisiac.
- apodeictical — Apodeictic.
- appendencies — attached or suspended; annexed.
- appendicitis — Appendicitis is an illness in which a person's appendix is infected and painful.
- appendicular — relating to an appendage or appendicle
- archdiocesan — Relating to an archdiocese.
- archdioceses — Plural form of archdiocese.
- archiannelid — (zoology) Any member of the Archiannelida.
- arctic daisy — a daisy, Chrysanthemum arcticum, of arctic regions, having asterlike heads of white or lilac flowers.
- aria da capo — an operatic aria in three sections with the first and third sections alike and the middle section contrasting.
- arsenic acid — a white poisonous soluble crystalline solid used in the manufacture of arsenates and insecticides. Formula: H3AsO4
- 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.
- asclepiadean — of or relating to a type of classical verse line consisting of a spondee, two or three choriambs, and an iamb
- astrodynamic — Pertaining to astrodynamics.
- auctioneered — Simple past tense and past participle of auctioneer.
- audiological — Of, or pertaining to, audiology, or the study of hearing.
- autodidactic — a person who has learned a subject without the benefit of a teacher or formal education; a self-taught person.
- back molding — a molding, as a backband, applied to interior window and door trim to conceal the edge of the wall surface.
- backpedaling — to retard the forward motion by pressing backward on the pedal, especially of a bicycle with coaster brakes.
- bacteria bed — a layer of sand or gravel used to expose sewage effluent, in its final stages, to air and the action of microorganisms
- bactericidal — any substance capable of killing bacteria.