| hireling | (noun) a person who works only for money | Synonyms: pensionary |
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| hirer | (noun) a person responsible for hiring workers | Synonyms: boss |
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| hirsuteness | (noun) excessive hairiness | Synonyms: hirsutism |
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| hirsutism | (noun) excessive hairiness | Synonyms: hirsuteness |
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| hirudinean | (noun) carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end | Synonyms: bloodsucker, leech |
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| hiss | (noun) a cry or noise made to express displeasure or contempt | Synonyms: bird, boo, Bronx cheer, hoot, raspberry, razz, razzing, snort |
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| (noun) a fricative sound (especially as an expression of disapproval) | Synonyms: fizzle, hissing, hushing, sibilation |
| hisser | (noun) someone who communicates disapproval by hissing | - |
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| hissing | (noun) a fricative sound (especially as an expression of disapproval) | Synonyms: fizzle, hiss, hushing, sibilation |
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| histaminase | (noun) enzyme that acts as a catalyst in converting histidine to histamine | - |
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| histamine | (noun) amine formed from histidine that stimulates gastric secretions and dilates blood vessels; released by the human immune system during allergic reactions | - |
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| histidine | (noun) an essential amino acid found in proteins that is important for the growth and repair of tissue | - |
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| histiocyte | (noun) a macrophage that is found in connective tissue | - |
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| histiocytosis | (noun) a blood disease characterized by an abnormal multiplication of macrophages | - |
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| histocompatibility | (noun) condition in which the cells of one tissue can survive in the presence of cells of another tissue | - |
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| histogram | (noun) a bar chart representing a frequency distribution; heights of the bars represent observed frequencies | - |
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| histoincompatibility | (noun) incompatibility in which one person's tissue cannot be transplanted to another person | - |
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| histologist | (noun) anatomist who specializes in the microscopic study of animal tissues | - |
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| histology | (noun) the branch of biology that studies the microscopic structure of animal or plant tissues | - |
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| histone | (noun) a simple protein containing mainly basic amino acids; present in cell nuclei in association with nucleic acids | - |
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| historian | (noun) a person who is an authority on history and who studies it and writes about it | Synonyms: historiographer |
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| historicalness | (noun) significance owing to its history | - |
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| (noun) the state of having in fact existed in the past | - |
| historicism | (noun) a theory that social and cultural events are determined by history | - |
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| historiographer | (noun) a person who is an authority on history and who studies it and writes about it | Synonyms: historian |
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| historiography | (noun) the writing of history | - |
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| (noun) a body of historical literature | - |
| history | (noun) the discipline that records and interprets past events involving human beings | - |
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| (noun) all that is remembered of the past as preserved in writing; a body of knowledge | - |
| (noun) a record or narrative description of past events | Synonyms: account, chronicle, story |
| (noun) the aggregate of past events | - |
| (noun) the continuum of events occurring in succession leading from the past to the present and even into the future | - |
| histrion | (noun) a theatrical performer | Synonyms: actor, player, role player, thespian |
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| histrionics | (noun) a performance of a play | Synonyms: representation, theatrical, theatrical performance |
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| (noun) a deliberate display of emotion for effect | - |
| hit | (noun) the act of contacting one thing with another | Synonyms: hitting, striking |
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| (noun) a conspicuous success | Synonyms: bang, smash, smasher, strike |
| (noun) (baseball) when a batter strikes a picthed ball into fair territory and arrives safely on base (without an error or a fielder's choice being made by the defense) | - |
| (noun) a murder carried out by an underworld syndicate | - |
| (noun) a connection made via the internet to another website | - |
| (noun) a dose of a narcotic drug | - |
| (noun) (physics) a brief event in which two or more bodies come together | Synonyms: collision |
| hitch | (noun) the uneven manner of walking that results from an injured leg | Synonyms: hobble, limp |
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| (noun) a knot that can be undone by pulling against the strain that holds it; a temporary knot | - |
| (noun) a connection between a vehicle and the load that it pulls | - |
| (noun) any obstruction that impedes or is burdensome | Synonyms: encumbrance, hinderance, hindrance, incumbrance, interference, preventative, preventive |
| (noun) an unforeseen obstacle | Synonyms: hang-up, rub, snag |
| (noun) the state of inactivity following an interruption | Synonyms: arrest, check, halt, stay, stop, stoppage |
| (noun) a period of time spent in military service | Synonyms: duty tour, enlistment, term of enlistment, tour, tour of duty |
| hitchhiker | (noun) a person who travels by getting free rides from passing vehicles | - |
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| hitchrack | (noun) a fixed horizontal rail to which a horse can be hitched to prevent it from straying | Synonyms: hitching bar |
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| hitman | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunman, gunslinger, hired gun, hit man, shooter, torpedo, triggerman |
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| hitter | (noun) (baseball) a ballplayer who is batting | Synonyms: batsman, batter, slugger |
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| (noun) someone who hits | Synonyms: striker |
| hitting | (noun) the act of contacting one thing with another | Synonyms: hit, striking |
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| hive | (noun) a man-made receptacle that houses a swarm of bees | Synonyms: beehive |
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| (noun) a teeming multitude | - |
| (noun) a structure that provides a natural habitation for bees; as in a hollow tree | Synonyms: beehive |
| hives | (noun) an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs | Synonyms: nettle rash, urticaria, urtication |
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