| 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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