| abbot | (noun) the superior of an abbey of monks | Synonyms: archimandrite |
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| bluebottle | (noun) blowfly with iridescent blue body; makes a loud buzzing noise in flight | Synonyms: Calliphora vicina |
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| (noun) an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers | Synonyms: bachelor's button, Centaurea cyanus, cornflower |
| bot | (noun) botfly larva; typically develops inside the body of a horse or sheep or human | - |
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| bota | (noun) a wine bottle made of leather | - |
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| botanical | (noun) a drug made from part of a plant (as the bark or root or leaves) | - |
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| botanist | (noun) a biologist specializing in the study of plants | Synonyms: phytologist, plant scientist |
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| botany | (noun) the branch of biology that studies plants | Synonyms: phytology |
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| (noun) all the plant life in a particular region or period | Synonyms: flora, vegetation |
| botch | (noun) an embarrassing mistake | Synonyms: bloomer, blooper, blunder, boner, boo-boo, bungle, flub, foul-up, fuckup, pratfall |
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| botcher | (noun) someone who makes mistakes because of incompetence | Synonyms: blunderer, bumbler, bungler, butcher, fuckup, fumbler, sad sack, stumbler |
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| botfly | (noun) stout-bodied hairy dipterous fly whose larvae are parasites on humans and other mammals | - |
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| bother | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, botheration, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) an angry disturbance | Synonyms: fuss, hassle, trouble |
| botheration | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, irritation, vexation |
| bottle | (noun) a glass or plastic vessel used for storing drinks or other liquids; typically cylindrical without handles and with a narrow neck that can be plugged or capped | - |
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| (noun) a vessel fitted with a flexible teat and filled with milk or formula; used as a substitute for breast feeding infants and very young children | Synonyms: feeding bottle, nursing bottle |
| (noun) the quantity contained in a bottle | Synonyms: bottleful |
| bottlebrush | (noun) a cylindrical brush on a thin shaft that is used to clean bottles | - |
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| bottlecap | (noun) a cap that seals a bottle | - |
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| bottleful | (noun) the quantity contained in a bottle | Synonyms: bottle |
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| bottleneck | (noun) the narrow part of a bottle near the top | - |
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| (noun) a narrowing that reduces the flow through a channel | Synonyms: chokepoint, constriction |
| bottlenose | (noun) northern Atlantic beaked whale with a bulbous forehead | Synonyms: bottle-nosed whale, bottlenose whale, Hyperoodon ampullatus |
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| (noun) any of several dolphins with rounded forehead and well-developed beak; chiefly of northern Atlantic and Mediterranean | Synonyms: bottle-nosed dolphin, bottlenose dolphin |
| bottler | (noun) a manufacturer that makes and bottles beverages | - |
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| bottom | (noun) a cargo ship | Synonyms: freighter, merchant ship, merchantman |
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| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| (noun) the lower side of anything | Synonyms: underside, undersurface |
| (noun) the lowest part of anything | - |
| (noun) a depression forming the ground under a body of water | Synonyms: bed |
| (noun) low-lying alluvial land near a river | Synonyms: bottomland |
| (noun) the second half of an inning; while the home team is at bat | Synonyms: bottom of the inning |
| bottomland | (noun) low-lying alluvial land near a river | Synonyms: bottom |
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| bottomlessness | (noun) the property of being very deep; without limit | - |
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| botulin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulinus toxin, botulismotoxin |
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| botulinum | (noun) anaerobic bacterium producing botulin the toxin that causes botulism | Synonyms: botulinus, Clostridium botulinum |
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| botulinus | (noun) anaerobic bacterium producing botulin the toxin that causes botulism | Synonyms: botulinum, Clostridium botulinum |
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| botulism | (noun) food poisoning from ingesting botulin; not infectious; affects the CNS; can be fatal if not treated promptly | - |
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| botulismotoxin | (noun) potent bacterial toxin produced by the bacterium Clostridium botulinum that causes botulism; can be used as a bioweapon | Synonyms: botulin, botulinus toxin |
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| burbot | (noun) elongate freshwater cod of northern Europe and Asia and North America having barbels around its mouth | Synonyms: cusk, eelpout, ling, Lota lota |
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| cabotage | (noun) navigation in coastal waters | - |
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| (noun) the exclusive right of a country to control the air traffic within its borders | - |
| greenbottle | (noun) blowfly with brilliant coppery green body | Synonyms: greenbottle fly |
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| jabot | (noun) a ruffle on the front of a woman's blouse or a man's shirt | - |
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| jaboticaba | (noun) tough-skinned purple grapelike tropical fruit grown in Brazil | - |
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| (noun) small evergreen tropical tree native to Brazil and West Indies but introduced into southern United States; grown in Brazil for its edible tough-skinned purple grapelike fruit that grows all along the branches | Synonyms: jaboticaba tree, Myrciaria cauliflora |
| lepidobotrys | (noun) African tree often classified in other families; similar to the Costa Rican caracolito in wood structure as well as in fruit and flowers and leaves and seeds | - |
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| lobotomy | (noun) surgical interruption of nerve tracts to and from the frontal lobe of the brain; often results in marked cognitive and personality changes | Synonyms: frontal lobotomy, leucotomy, leukotomy, prefrontal leucotomy, prefrontal leukotomy, prefrontal lobotomy |
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| palaeobotany | (noun) the study of fossil plants | Synonyms: paleobotany |
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| paleobotany | (noun) the study of fossil plants | Synonyms: palaeobotany |
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| phlebothrombosis | (noun) thrombosis of a vein without prior inflammation of the vein; associated with sluggish blood flow (as in prolonged bedrest or pregnancy or surgery) or with rapid coagulation of the blood | Synonyms: venous thrombosis |
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| phlebotomist | (noun) someone who practices phlebotomy | - |
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| phlebotomus | (noun) a mild viral disease transmitted by the bite of the sand fly Phlebotomus papatasii | Synonyms: pappataci fever, sandfly fever |
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| phlebotomy | (noun) surgical incision into a vein; used to treat hemochromatosis | Synonyms: venesection |
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| rambotan | (noun) pleasantly acid bright red oval Malayan fruit covered with soft spines | Synonyms: rambutan |
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| (noun) Malayan tree bearing spiny red fruit | Synonyms: Nephelium lappaceum, rambutan, rambutan tree |
| robot | (noun) a mechanism that can move automatically | Synonyms: automaton, golem |
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| robotics | (noun) the area of AI concerned with the practical use of robots | - |
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| sabot | (noun) footwear usually with wooden soles | Synonyms: clog, geta, patten |
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| (noun) a shoe carved from a single block of wood | Synonyms: wooden shoe |
| sabotage | (noun) a deliberate act of destruction or disruption in which equipment is damaged | - |
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| saboteur | (noun) someone who commits sabotage or deliberately causes wrecks | Synonyms: diversionist, wrecker |
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| (noun) a member of a clandestine subversive organization who tries to help a potential invader | Synonyms: fifth columnist |
| strabotomy | (noun) the surgical operation of cutting a muscle or tendon of the eye in order to correct strabismus | - |
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| telerobotics | (noun) the area of robotics that is concerned with the control of robots from a distance | - |
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| turbot | (noun) a large brownish European flatfish | Synonyms: Psetta maxima |
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| (noun) flesh of a large European flatfish | - |