12-letter words containing a, b, s, t, r, i
- bastard wing — a tuft of feathers attached to the first digit of a bird, distinct from the wing feathers attached to the other digits and the ulna
- bastardizing — Present participle of bastardize.
- beamsplitter — Alternative spelling of beam splitter.
- bear witness — to give written or oral testimony
- beauty strip — a narrow forest corridor left uncut alongside a road or body of water.
- beggar-ticks — any of various plants, such as the bur marigold and tick trefoil, having fruits or seeds that cling to clothing, fur, etc
- below stairs — People sometimes use below stairs to refer to the servants in a rich household and the things that are connected with them.
- beta orionis — Rigel
- beta version — beta testing
- beth midrash — a place where Jews gather to study the Talmud and other religious writings; a small synagogue.
- bilateralism — the practice of being bilateral
- bioastronomy — the branch of biology which deals with the study or the discovery of life forms on other planets or in space
- biscuit ware — unglazed earthenware
- bitter aloes — a bitter purgative drug made from the leaves of several species of aloe
- bitter lakes — two lakes, the Great Bitter Lake and Little Bitter Lake in NE Egypt: part of the Suez Canal
- blatherskite — a talkative silly person
- blazing star — a North American liliaceous plant, Chamaelirium luteum, with a long spike of small white flowers
- blister pack — a type of packet in which small items are displayed and sold, consisting of a transparent dome of plastic or similar material mounted on a firm backing such as cardboard
- blues guitar — blues guitar music
- borosilicate — a salt of boric and silicic acids
- brain teaser — A brain teaser is a question, problem, or puzzle that is difficult to answer or solve, but is not serious or important.
- brain-teaser — a puzzle or problem whose solution requires great ingenuity.
- brains trust — a group of knowledgeable people who discuss topics in public or on radio or television
- brainstormer — a person who brainstorms
- brake assist — a part of a vehicle's braking system that automatically boosts braking pressure in an emergency situation
- breast drill — a geared drill that can be braced against the chest for additional leverage.
- bridal suite — a room or set of rooms in a hotel for newly married couples
- bright spark — If you say that some bright spark had a particular idea or did something, you mean that their idea or action was clever, or that it seemed clever but was silly in some way.
- british rail — the organization that ran the British railway system from 1948 until privatization in the mid-1990s
- british warm — an army officer's short thick overcoat
- brittle star — any echinoderm of the class Ophiuroidea, having the body composed of a central, rounded disk from which radiate long, slender, fragile arms.
- brittle-star — any echinoderm of the class Ophiuroidea, occurring on the sea bottom and having five long slender arms radiating from a small central disc
- broadcasting — Broadcasting is the making and sending out of television and radio programmes.
- brushability — the quality of being brushable
- bunco artist — a confidence trickster or con artist
- burnt sienna — a reddish-brown dye or pigment obtained by roasting raw sienna in a furnace
- burro's tail — a succulent Mexican plant, Sedum morganianum, of the stonecrop family, bearing small, rose-colored flowers and long, hanging, nearly cylindrical stems with closely packed whitish-green leaves.
- bypass ratio — the ratio of the amount of air that bypasses the combustion chambers of an aircraft gas turbine to that passing through them
- cabot strait — a channel in Canada, connecting the Gulf of St. Lawrence with the Atlantic Ocean. 68 miles (109 km) wide.
- calibrations — Plural form of calibration.
- canterburies — Plural form of canterbury.
- carbocations — Plural form of carbocation.
- carbonatites — Plural form of carbonatite.
- catbird seat — an enviable position, as of power
- celebrations — Plural form of celebration.
- cerebrations — Plural form of cerebration.
- conurbations — Plural form of conurbation.
- cristobalite — a white microcrystalline mineral consisting of silica and occurring in volcanic rocks. Formula: SiO2
- criticisable — Alternative form of criticizable.
- crossability — the quality of being crossable