| blood | (noun) temperament or disposition | - |
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| (noun) the fluid (red in vertebrates) that is pumped through the body by the heart and contains plasma, blood cells, and platelets | - |
| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| (noun) people viewed as members of a group | - |
| (noun) a dissolute man in fashionable society | Synonyms: profligate, rake, rakehell, rip, roue |
| bloodbath | (noun) indiscriminate slaughter | Synonyms: battue, bloodletting, bloodshed |
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| bloodberry | (noun) bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas | Synonyms: blood berry, Rivina humilis, rouge plant, rougeberry |
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| bloodguilt | (noun) the state of being guilty of bloodshed and murder | - |
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| bloodhound | (noun) a breed of large powerful hound of European origin having very acute smell and used in tracking | Synonyms: sleuthhound |
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| bloodiness | (noun) a disposition to shed blood | Synonyms: bloodthirstiness |
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| (noun) the state of being bloody | - |
| bloodleaf | (noun) any plant of the genus Iresine having colored foliage | - |
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| bloodletting | (noun) formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine) | - |
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| (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodshed |
| bloodline | (noun) ancestry of a purebred animal | Synonyms: pedigree |
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| (noun) the hereditary derivation of an individual | Synonyms: ancestry, blood, blood line, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| bloodlust | (noun) a desire for bloodshed | - |
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| bloodmobile | (noun) a motor vehicle equipped to collect blood donations | - |
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| bloodroot | (noun) perennial woodland native of North America having a red root and red sap and bearing a solitary lobed leaf and white flower in early spring and having acrid emetic properties; rootstock used as a stimulant and expectorant | Synonyms: puccoon, redroot, Sanguinaria canadensis, tetterwort |
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| bloodshed | (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodletting |
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| (noun) the shedding of blood resulting in murder | Synonyms: gore |
| bloodstain | (noun) a discoloration caused by blood | - |
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| bloodstock | (noun) thoroughbred horses (collectively) | - |
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| bloodstone | (noun) green chalcedony with red spots that resemble blood | Synonyms: heliotrope |
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| bloodstream | (noun) the blood flowing through the circulatory system | Synonyms: blood stream |
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| bloodsucker | (noun) carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end | Synonyms: hirudinean, leech |
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| bloodthirstiness | (noun) a disposition to shed blood | Synonyms: bloodiness |
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| bloodworm | (noun) a segmented marine worm with bright red body; often used for bait | - |
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| bloodwort | (noun) any of various plants of the family Haemodoraceae; roots contain a deep red coloring matter | - |
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| bloom | (noun) a powdery deposit on a surface | Synonyms: efflorescence |
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| (noun) reproductive organ of angiosperm plants especially one having showy or colorful parts | Synonyms: blossom, flower |
| (noun) the organic process of bearing flowers | Synonyms: blooming |
| (noun) a rosy color (especially in the cheeks) taken as a sign of good health | Synonyms: blush, flush, rosiness |
| (noun) the best time of youth | Synonyms: bloom of youth, salad days |
| (noun) the period of greatest prosperity or productivity | Synonyms: blossom, efflorescence, flower, flush, heyday, peak, prime |
| bloomer | (noun) an embarrassing mistake | Synonyms: blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| (noun) a flower that blooms in a particular way | - |
| bloomers | (noun) (used in the plural) underpants worn by women | Synonyms: drawers, knickers, pants |
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| blooming | (noun) the organic process of bearing flowers | Synonyms: bloom |
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| blooper | (noun) an embarrassing mistake | Synonyms: bloomer, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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