12-letter words containing a, e, o
- black copper — a regulus of 95-percent-pure copper, produced in a blast furnace by smelting oxidized copper ores.
- black forest — wooded mountain region in SW Germany
- black grouse — a large N European grouse, Lyrurus tetrix, the male of which has a bluish-black plumage and lyre-shaped tail
- black heroin — a very potent and addictive form of heroin that is dark-colored.
- black powder — gunpowder as used in sports involving modern muzzleloading firearms
- black sapote — a tropical American tree, Diospyros digyna, related to the persimmon, having sweet, edible, green fruit that turns black when ripe.
- black scoter — a scoter of Eurasia and North America, Melanitta nigra, the adult male of which is black.
- black tongue — canine pellagra.
- black-coated — (esp formerly) (of a worker) clerical or professional, as distinguished from commercial or industrial
- bladder worm — an encysted saclike larva of the tapeworm. The main types are cysticercus, hydatid, and coenurus
- blanket roll — a blanket or sleeping bag rolled into a cylindrical pack for easy carrying and outdoor use by hikers, soldiers, cowboys, etc., often with cooking utensils, food, and personal articles carried inside.
- blanket toss — a game in which a person is repeatedly tossed into the air and caught on an open blanket by a group of people who hold the blanket at its edges and stretch and relax it for each toss and catch.
- blastocoelic — of or relating to the blastocoel
- blastomycete — any of a genus (Blastomyces) of yeastlike imperfect fungi that cause diseases in people and animals
- blastosphere — blastula
- blaze orange — a very bright orange, as on a traffic cone.
- blennorrhoea — an excessive discharge of watery mucus, esp from the urethra or the vagina
- bletheration — nonsense!
- block heater — an electrically operated immersion heater fitted either to enter the water hose or the water jacket surrounding the cylinder block of a motor to warm the coolant in cold weather.
- blood orange — a variety of orange all or part of the pulp of which is dark red when ripe
- blood sample — an amount of a person's blood taken from their body for use in medical tests
- bloodstained — Someone or something that is bloodstained is covered with blood.
- bloomingdale — a town in NE Illinois.
- board member — a member of board of directors
- boarder baby — an infant or young child who is abandoned or orphaned and left in a hospital for lack of a foster home.
- boating lake — a lake in a park where rowing boats can be hired
- bobbery pack — a mixed pack of hunting dogs, often not belonging to any of the hound breeds
- body repairs — repairs to the bodywork of cars
- body scanner — a machine using X-rays and a computer, used in medicine to look for signs of disease, or in security operations to look for drugs, weapons, etc
- bog asphodel — either of two liliaceous plants, Narthecium ossifragum of Europe or N. americanum of North America, that grow in boggy places and have small yellow flowers and grasslike leaves
- bog of allen — a region of peat bogs in central Ireland, west of Dublin. Area: over 10 sq km (3.75 sq miles)
- bog rosemary — any of several species (genus Andromeda) of evergreen shrubs of the heath family, native to cold bogs of North America and Europe, with pink flowers and narrow leaves
- boghead coal — compact bituminous coal that burns brightly and yields large quantities of tar and oil upon distillation.
- boilermaking — metal-working in heavy industry; plating or welding
- boletic acid — fumaric acid.
- bombacaceous — of, relating to, or belonging to the Bombacaceae, a family of tropical trees, including the kapok tree and baobab, that have very thick stems, often with water-storing tissue
- bombe glacée — a dessert of ice cream lined or filled with custard, cake crumbs, etc
- bond servant — a person who serves in bondage; slave.
- boniface iii — pope a.d. 607.
- boniface vii — antipope a.d. 974, 984–985.
- bonne chance — good luck
- bonnet glass — monteith (def 2).
- bonnet-glass — a large punch bowl, usually of silver, having a notched rim for suspending punch cups.
- bonnyclabber — clotted or curdled milk
- boobytrapped — to set with or as if with a booby trap; attach a booby trap to or in.
- boogie board — a small, flexible plastic surfboard, ridden lying down.
- book matches — safety matches made of paper and fastened into a small cardboard folder
- booklet pane — Philately. any of a number of panes or small pages of postage stamps, stapled together into a booklet for the convenience of users.
- boolean ring — a nonempty collection of sets having the properties that the union of two sets of the collection is a set in the collection and that the relative complement of each set with respect to any other set is in the collection.
- boomer state — Oklahoma