13-letter words containing a, c, o, i
- bisectionally — from a bisectional point of view
- black diamond — coal (sense 1)
- black hickory — a species of smooth-barked hickory, Carya tomentosa, with fragrant foliage that turns bright yellow in autumn
- black section — (in Britain in the 1980s) an unofficial group within the Labour Party in any constituency that represented the interests of local Black people
- blasco ibanez — Vicente (biˈθente). 1867–1928, Spanish novelist, whose books include Blood and Sand (1909) and The Four Horsemen of the Apocalypse (1916)
- blastomycosis — a fungal infection particularly affecting the lungs
- block capital — a sans-serif letter with lines of uniform weight.
- block diagram — a diagram showing the interconnections between the parts of an industrial process
- boarding card — A boarding card is a card which a passenger must have when boarding a plane or a boat.
- boat neckline — a wide, high neckline that follows the curve of the collarbone and ends in points on the shoulder seams.
- bois de vache — dried buffalo dung, used as fuel by Canadian and U.S. fur trappers in the 18th and 19th centuries.
- bombastically — (of speech, writing, etc.) high-sounding; high-flown; inflated; pretentious.
- bona vacantia — unclaimed goods
- boniface viii — original name Benedict Caetano. ?1234–1303, pope (1294–1303)
- boolean logic — (logic) A logic based on Boolean algebra.
- boraginaceous — of, relating to, or belonging to the Boraginaceae, a family of temperate and tropical typically hairy-leaved flowering plants that includes forget-me-not, lungwort, borage, comfrey, and heliotrope
- boron carbide — a black extremely hard inert substance having a high capture cross section for thermal neutrons. It is used as an abrasive, refractory, and in control rods in nuclear reactors. Formula: B4C
- bowling match — a game of bowls
- brace molding — keel1 (def 6).
- brachiosaurus — a dinosaur of the genus Brachiosaurus, up to 30 metres long: the largest land animal ever known
- braggadocious — boastful
- branch office — the local branch of a bank, shop, or other business
- brassicaceous — belonging to the plant family Brassicaceae, an alternative name for the plant family Cruciferae.
- breechloading — loaded at the breech.
- broca-aphasia — a type of aphasia caused by a lesion in Broca's area of the brain, characterized by misarticulated speech and lack of grammatical morphemes.
- broccoli raab — a plant (Brassica rapa ruvo) of the crucifer family with close clusters of small flowers and dark green, somewhat bitter leaves cooked as a vegetable
- broccoli rabe — a plant, Brassica rapa ruvo, of which the slightly bitter, dark-green leaves and clustered flower buds are eaten as a vegetable.
- buffalo chips — the dried dung of buffalo used as fuel, especially by early settlers on the western plains.
- butanoic acid — kind of acid
- by contraries — contrary to what is expected
- c corporation — A C corporation is a type of corporation which is taxed on its income.
- cable molding — a molding in the form of a rope.
- cacographical — Synonym of cacographic.
- caesaropapism — the theory that the state should have authority over the church in ecclesiastical matters; Erastianism
- caesium clock — a type of atomic clock that uses the frequency of radiation absorbed in changing the spin of electrons in caesium atoms
- cainotophobia — Alternative form of cainophobia.
- calcariferous — having a spur or spurs
- calcification — the process of calcifying or becoming calcified
- calcium oxide — a white crystalline base used in the production of calcium hydroxide and bleaching powder and in the manufacture of glass, paper, and steel. Formula: CaO
- calcium-oxide — Also called burnt lime, calcium oxide, caustic lime, calx, quicklime. a white or grayish-white, odorless, lumpy, very slightly water-soluble solid, CaO, that when combined with water forms calcium hydroxide (slaked lime) obtained from calcium carbonate, limestone, or oyster shells: used chiefly in mortars, plasters, and cements, in bleaching powder, and in the manufacture of steel, paper, glass, and various chemicals of calcium.
- calculational — relating to calculation
- calico flower — a Brazilian woody vine, Aristolochia elegans, of the birthwort family, having large, solitary, white-spotted, purple flowers.
- calorifacient — (of foods) producing heat.
- camp fire boy — a boy who is a member of the Campfire Boys and Girls. Compare Camp Fire Girl.
- campaniliform — Alternative form of campaniform.
- campanologist — the principles or art of making bells, bell ringing, etc.
- camping stool — a stool which is suitable for use in temporary quarters, on holiday, etc, esp by being portable and easy to set up
- camping stove — a portable stove powered by butane gas canisters, designed to be used for cooking while camping
- campus police — police officers, security guards or students employed by a college or university to patrol the campus and to protect students, staff, and visitors
- cancellations — Plural form of cancellation.