| prolactin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, luteotropin |
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| prolamine | (noun) a simple protein found in plants | - |
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| prolapse | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapsus |
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| prolapsus | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapse |
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| prole | (noun) a member of the working class (not necessarily employed) | Synonyms: proletarian, worker |
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| prolegomenon | (noun) a preliminary discussion inserted at the beginning of a book or treatise | - |
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| prolepsis | (noun) anticipating and answering objections in advance | - |
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| proletarian | (noun) a member of the working class (not necessarily employed) | Synonyms: prole, worker |
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| proletarianism | (noun) The condition or political position of a member of the working class. | - |
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| proletariat | (noun) a social class comprising those who do manual labor or work for wages | Synonyms: labor, labour, working class |
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| proliferation | (noun) growth by the rapid multiplication of parts | - |
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| (noun) a rapid increase in number (especially a rapid increase in the number of deadly weapons) | - |
| prolificacy | (noun) the property of producing abundantly and sustaining vigorous and luxuriant growth | Synonyms: fertility, rankness, richness |
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| proline | (noun) an amino acid that is found in many proteins (especially collagen) | - |
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| prolixity | (noun) boring verbosity | Synonyms: long-windedness, prolixness, windiness, wordiness |
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| prolixness | (noun) boring verbosity | Synonyms: long-windedness, prolixity, windiness, wordiness |
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| prologue | (noun) an introduction to a play | - |
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| prolongation | (noun) the act of prolonging something | Synonyms: lengthening, perpetuation, protraction |
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| (noun) amount or degree or range to which something extends | Synonyms: extension, lengthiness |
| (noun) the consequence of being lengthened in duration | Synonyms: continuation, lengthiness, protraction |
| prolonge | (noun) a rope fitted with a hook and used for towing a gun carriage | - |
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| prolusion | (noun) exercising in preparation for strenuous activity | Synonyms: tune-up, warm-up |
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| (noun) a short introductory essay preceding the text of a book | Synonyms: foreword, preface |