| 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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| (verb) slip or fall out of place, as of body parts | - |
| prolapsus | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: descensus, prolapse |
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| prolate | (adjective) having the polar diameter greater than the equatorial diameter | Synonyms: watermelon-shaped |
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| (adjective) rounded like an egg | Synonyms: egg-shaped, elliptic, elliptical, oval-shaped, oval, ovate, oviform, ovoid |
| 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 | (adjective) belonging to or characteristic of the proletariat | - |
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| (noun) a member of the working class (not necessarily employed) | Synonyms: prole, worker |
| 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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| proliferate | (verb) grow rapidly | - |
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| (verb) cause to grow or increase rapidly | - |
| 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) | - |
| prolific | (adjective) bearing in abundance especially offspring | Synonyms: fertile |
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| (adjective) intellectually productive | Synonyms: fecund, fertile |
| 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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| prolix | (adjective) tediously prolonged or tending to speak or write at great length | Synonyms: verbal |
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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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| prologise | (verb) write or speak a prologue | Synonyms: prologize, prologuize |
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| prologize | (verb) write or speak a prologue | Synonyms: prologise, prologuize |
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| prologue | (noun) an introduction to a play | - |
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| prologuize | (verb) write or speak a prologue | Synonyms: prologise, prologize |
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| prolong | (verb) lengthen in time; cause to be or last longer | Synonyms: draw out, extend, protract |
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| (verb) lengthen or extend in duration or space | Synonyms: keep up, sustain |
| 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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| prolonged | (adjective) drawn out or made longer spatially | Synonyms: elongated, extended, lengthened |
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| (adjective) relatively long in duration; tediously protracted | Synonyms: drawn-out, extended, lengthy, protracted |
| 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 |
| prolusory | (adjective) of or relating to or having the character of a prolusion | - |
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