13-letter words containing a, c, t, u
- autocephalous — (of an Eastern Christian Church) governed by its own national synods and appointing its own patriarchs or prelates
- autochthonous — (of rocks, deposits, etc) found where they and their constituents were formed
- autodidactism — Alternative form of autodidacticism.
- autoeroticism — the arousal and use of one's own body as a sexual object, as through masturbation
- autographical — Relating to, or used in, the process of autography.
- autoinfection — infection by a pathogenic agent already within the body or infection transferred from one part of the body to another
- automagically — automatically; in a way that is hidden from or not understood by the user, and in that sense, apparently “magical”: I downloaded an app that automagically adds a travel itinerary to my calendar whenever I buy a plane ticket.
- automatically — without volition or from force of habit; mechanically: Whenever I hear that song, I automatically think of my dad.
- automechanism — an automatic mechanical system or component, especially a device that operates automatically under predetermined conditions.
- autonomically — autonomous.
- autoprojector — (theory) A self-applicable partial evaluator.
- autorickshaws — Plural form of autorickshaw.
- autoschediasm — anything done with little forethought or preparation
- autoschediaze — to do or act with little forethought or preparation
- autotoxicosis — autointoxication.
- autumn crocus — a liliaceous plant, Colchicum autumnale, of Europe and N Africa having pink or purplish autumn flowers
- averruncation — the act of averting or turning away
- azurmalachite — a blue-green ornamental stone consisting of a mixture of azurite and malachite.
- baccalaureate — The baccalaureate is an examination taken by students at the age of eighteen in France and some other countries.
- back mutation — the reversion of a mutant to the original phenotype
- back-up light — a light on the rear of a motor vehicle to warn others that the vehicle is being reversed
- badminton cup — a long refreshing drink of claret with soda water and sugar
- band spectrum — a spectrum consisting of a number of bands of closely spaced lines that are associated with emission or absorption of radiation by molecules
- bank discount — interest on a loan deducted from the principal amount when the loan is made and based on the loan's face value
- barcoo salute — a movement of the hand to brush flies away from the face
- barrel cactus — any of several large, cylindrical, ribbed, spiny cacti of the genera Echinocactus and Ferocactus.
- basket clause — an all-inclusive or comprehensive clause in a contract
- bathtub curve — Common term for the curve (resembling an end-to-end section of one of those claw-footed antique bathtubs) that describes the expected failure rate of electronics with time: initially high, dropping to near 0 for most of the system's lifetime, then rising again as it "tires out". See also burn-in period, infant mortality.
- battlecruiser — A large warship of a type built in the early 20th century, carrying similar armament to a battleship but faster and more lightly armored.
- beacon status — a ranking awarded by the government to an organization, rendering it eligible for extra funding, and aimed at encouraging organizations to share good practice with each other
- beta function — a function of two variables, usually expressed as an improper integral and equal to the quotient of the product of the values of the gamma function at each variable divided by the value of the gamma function at the sum of the variables.
- biculturalism — the characteristics, or policy, of a two-cultured society
- bidenticulate — having two small teeth or toothlike processes.
- bioaccumulate — (of substances, esp toxins) to build up within the tissues of organisms
- birectangular — having two right angles.
- biscuit bread — biscuits or a biscuit: I like biscuit bread more than corn bread for supper.
- black country — a district in the English Midlands, around Birmingham: so called from the soot and grime produced by the many local industries.
- black currant — the small, round, blackish, edible fruit of a widely cultivated shrub, Ribes nigrum, of the saxifrage family.
- black mustard — a Eurasian plant, Brassica (or Sinapsis) nigra, with clusters of yellow flowers and pungent seeds from which the condiment mustard is made: family Brassicaceae (crucifers)
- black quarter — blackleg (def 1).
- black studies — a program of studies in black history and culture offered by a school or college, often including Afro-American history and black literature.
- black vulture — the Eurasian vulture, Aegypius monachus, of the family Accipitridae
- blame culture — the tendency to look for one person or organization that can be held responsible for a bad state of affairs, an accident, etc
- blast furnace — A blast furnace is a large structure in which iron ore is heated under pressure so that it melts and the pure iron metal separates out and can be collected.
- bouncy castle — A bouncy castle is a large object filled with air, often in the shape of a castle, which children play on at a fairground or other outdoor event.
- brachypterous — having very short or incompletely developed wings
- brilliant cut — a cut for gems
- brilliant-cut — a cut intended to enhance the brilliance of a gem with the least possible sacrifice of weight, characterized by a form resembling two pyramids set base to base, truncated so as to give a broad table and a very small culet, and having from 18 to 104 facets, 58 being typical.
- buck sergeant — a newly promoted sergeant
- bucket ladder — a series of buckets that move in a continuous chain, used to dredge riverbeds, etc, or to excavate land