13-letter words containing r, a, t
- bidirectional — (of a printhead) capable of printing from left to right and from right to left
- big brown bat — any of several small to medium-sized common bats of the genera Myotis and Eptesicus, found worldwide in caves, trees, and buildings, including M. lucifugus (little brown bat) and E. fuscus (big brown bat) a widespread North American species.
- big-heartedly — in a big-hearted manner
- binary system — a system involving only two elements, as 0 and 1 or yes and no.
- bio-autograph — an analytical technique in which organic compounds are separated by chromatography and identified by studying their effects on microorganisms.
- bioautography — an analytical technique in which organic compounds are separated by chromatography and identified by studying their effects on microorganisms.
- bioelectrical — relating to electrical current generated by biological activity
- biotic factor — a living thing, as an animal or plant, that influences or affects an ecosystem: How do humans affect other biotic factors? Weather is not a biotic factor because it is not alive.
- bipartisanism — the quality of being bipartisan
- bird-watching — Bird-watching is the activity of watching and studying wild birds in their natural surroundings.
- birectangular — having two right angles.
- birth parents — a child's biological parents, regardless of whether they subsequently bring up the child
- birthday bash — a birthday party
- birthday cake — a special cake eaten at a birthday party
- birthday card — a greeting card sent on someone's birthday
- birthday girl — the girl or woman whose birthday is being celebrated
- birthday suit — If you are in your birthday suit, you are not wearing any clothes.
- birthing ball — a large soft rubber ball used by women during childbirth to give support and to aid pain relief
- biscuit bread — biscuits or a biscuit: I like biscuit bread more than corn bread for supper.
- bitter almond — a variety of almond whose bitter seeds yield hydrocyanic acid upon hydrolysis
- bitter orange — a globose, reddish-yellow, bitter or sweet, edible citrus fruit.
- 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 margate — a grayish grunt, Anisotremus surinamensis, of the Atlantic Ocean from Florida to Brazil.
- 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 panther — (in the US) a member of a militant Black political party (1965–82) founded to end the political dominance of White people
- black quarter — blackleg (def 1).
- black tracker — an Aboriginal tracker working for the police
- black treacle — molasses
- black vulture — the Eurasian vulture, Aegypius monachus, of the family Accipitridae
- black-hearted — evil, malicious, or wicked
- 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
- blamestorming — a discussion or meeting for the purpose of assigning blame.
- blanketflower — a hardy flowering plant, Gaillardia aristata, that grows in the US
- blarney stone — a stone in Blarney Castle, in the SW Republic of Ireland, said to endow whoever kisses it with the gift of the gab and skill in flattery
- 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.
- blaze a trail — to explore new territories, areas of knowledge, etc, in such a way that others can follow
- blepharoplast — a cylindrical cytoplasmic body in protozoa
- board meeting — a meeting of the board of a company or other organization
- body snatcher — (formerly) a person who robbed graves and sold the corpses for dissection
- bohr magneton — a unit that is used to indicate the magnetic moment of the electron structure in an atom, equal to 9.27 × 10 −21 erg/gauss.
- bomber jacket — A bomber jacket is a short jacket which is gathered into a band at the waist or hips.
- booby-trapped — (of a building, vehicle, etc) planted with a booby trap
- boom operator — a person who operates a boom
- booster cable — either of a pair of electric cables having clamps at each end and used for starting the engine of a vehicle whose battery is dead.
- bootlace worm — a nemertean worm, Lineus longissimus, that inhabits shingly shores and attains lengths of over 6 m (20 ft)
- border patrol — a government agency in charge of preventing terrorists, weapons, and illegal immigrants entering the country
- border states — slave states bordering on the free states before the Civil War: Mo., Ky., Va., Md., & Del.
- borlotti bean — variety of kidney bean
- boston matrix — a two-dimensional matrix, used in planning the business strategy of a large organization, that identifies those business units in the organization that generate cash and those that use it