12-letter words containing o, b, s, t
- bird-spotter — a bird-watcher
- bit of skirt — a girl or woman
- biting louse — any wingless insect of the order Mallophaga, such as the chicken louse: external parasites of birds and mammals with biting mouthparts
- bitter aloes — a bitter purgative drug made from the leaves of several species of aloe
- black forest — wooded mountain region in SW Germany
- black locust — Also called false acacia, yellow locust. a North American tree, Robinia pseudoacacia, of the legume family, having pinnate leaves and clusters of fragrant white flowers.
- 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.
- 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
- blastulation — the process of blastula formation
- block system — the system whereby a railway is divided up into separate sections of track where only one train can travel at a time
- blockbusting — A blockbusting film or book is one that is very successful, usually because it is very exciting.
- blood sister — a sister by birth
- bloodstained — Someone or something that is bloodstained is covered with blood.
- bloodthirsty — Bloodthirsty people are eager to use violence or display a strong interest in violent things. You can also use bloodthirsty to refer to very violent situations.
- bloody shirt — something, as a political issue or historical event, that can be used to stir up outrage, partisan support, etc.
- blossom into — the flower of a plant, especially of one producing an edible fruit.
- blue stilton — a rich cheese made from whole milk, blue-veined and very strong in flavour
- bluestocking — A bluestocking is an intellectual woman.
- board shorts — shorts with longer legs, originally meant to protect a surfer's legs against the surfboard
- boatsmanship — seamanship as applied to boats, especially rowboats and motorboats.
- body bolster — the lower transverse member of a car body to which the body center plate is attached.
- boehm system — a system of improved fingering and keying for the flute and clarinet, invented by the German musician Theobald Boehm (1794–1881).
- bog-standard — If you describe something as bog-standard you mean that is an ordinary example of its kind, with no exciting or interesting features.
- boiled shirt — a dress shirt with a stiff front
- boiled sweet — Boiled sweets are hard sweets that are made from boiled sugar.
- boisterously — rough and noisy; noisily jolly or rowdy; clamorous; unrestrained: the sound of boisterous laughter.
- bolshevistic — of, relating to, or characteristic of Bolshevists or Bolshevism.
- bomb shelter — a shelter, usually underground, in which people take refuge from bomb attacks
- bond servant — a person who serves in bondage; slave.
- bone density — the degree of compactness of bone
- bonnet glass — monteith (def 2).
- bonnet-glass — a large punch bowl, usually of silver, having a notched rim for suspending punch cups.
- book matches — safety matches made of paper and fastened into a small cardboard folder
- book society — book club.
- boom-or-bust — boom-and-bust.
- boomer state — Oklahoma
- booster dose — a supplementary injection of a vaccine given to maintain the immunization provided by an earlier dose
- booster pump — A booster pump is a pump which is used where pressure is low and needs to be increased.
- booster seat — A booster seat or a booster cushion is a special seat which allows a small child to sit in a higher position, for example at a table or in a car.
- booster shot — an injection of a vaccine or other antigen some time after the initial series of injections, for maintaining immunity
- boot-scraper — a contraption consisting of an upright metal shape formerly placed outside some houses to enable people to scrape the mud from their boots before going in
- bootlessness — the quality of being useless or ineffective
- bootylicious — sexually attractive, esp with curvaceous buttocks
- border state — a state adjacent to a border
- border taxes — taxes payable on goods taken across a border
- borosilicate — a salt of boric and silicic acids