| prop | (noun) a support placed beneath or against something to keep it from shaking or falling | - |
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| (noun) a propeller that rotates to push against air | Synonyms: airplane propeller, airscrew |
| (noun) any movable articles or objects used on the set of a play or movie | Synonyms: property |
| propaedeutic | (noun) a course that provides an introduction to an art or science (or to more advanced study generally) | Synonyms: propaedeutics |
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| propaedeutics | (noun) a course that provides an introduction to an art or science (or to more advanced study generally) | Synonyms: propaedeutic |
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| propaganda | (noun) information that is spread for the purpose of promoting some cause | - |
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| propagandist | (noun) a person who disseminates messages calculated to assist some cause or some government | - |
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| propagation | (noun) the act of producing offspring or multiplying by such production | Synonyms: generation, multiplication |
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| (noun) the spreading of something (a belief or practice) into new regions | Synonyms: extension |
| (noun) the movement of a wave through a medium | - |
| propagator | (noun) someone who spreads the news | Synonyms: disseminator |
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| (noun) someone who propagates plants (as under glass) | - |
| propanal | (noun) a colorless liquid aldehyde | Synonyms: propionaldehyde |
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| propanamide | (noun) the amide of propionic acid (C2H5CONH2) | Synonyms: proprionamide |
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| propane | (noun) colorless gas found in natural gas and petroleum; used as a fuel | - |
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| propanediol | (noun) a sweet colorless, viscous, hygroscopic liquid used as an antifreeze and in brake fluid and also as a humectant in cosmetics and personal care items although it can be absorbed through the skin with harmful effects | Synonyms: propylene glycol |
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| propanol | (noun) a clear colorless volatile liquid (alcohol) used as a solvent and antiseptic | Synonyms: propyl alcohol |
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| propanone | (noun) the simplest ketone; a highly flammable liquid widely used as an organic solvent and as material for making plastics | Synonyms: acetone, dimethyl ketone |
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| proparoxytone | (noun) word having stress or acute accent on the antepenult | - |
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| propellant | (noun) any substance that propels | Synonyms: propellent |
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| propellent | (noun) any substance that propels | Synonyms: propellant |
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| propeller | (noun) a mechanical device that rotates to push against air or water | Synonyms: propellor |
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| propellor | (noun) a mechanical device that rotates to push against air or water | Synonyms: propeller |
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| propenal | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: acrolein |
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| propene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propylene |
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| propenoate | (noun) a salt or ester of propenoic acid | Synonyms: acrylate |
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| propenonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: acrylonitrile, vinyl cyanide |
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| propensity | (noun) a disposition to behave in a certain way | Synonyms: aptness |
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| (noun) a natural inclination | Synonyms: leaning, proclivity |
| (noun) an inclination to do something | Synonyms: leaning, tendency |
| properness | (noun) correct or appropriate behavior | Synonyms: correctitude, propriety |
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| property | (noun) any movable articles or objects used on the set of a play or movie | Synonyms: prop |
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| (noun) a basic or essential property shared by all members of a class | - |
| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: attribute, dimension |
| (noun) any area set aside for a particular purpose | Synonyms: place |
| (noun) something owned; any tangible or intangible possession that is owned by someone | Synonyms: belongings, holding |
| prophase | (noun) the first stage of mitosis | - |
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| (noun) the first stage of meiosis | - |
| prophecy | (noun) knowledge of the future (usually said to be obtained from a divine source) | Synonyms: prognostication, vaticination |
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| (noun) a prediction uttered under divine inspiration | Synonyms: divination |
| prophesier | (noun) an authoritative person who divines the future | Synonyms: oracle, prophet, seer, vaticinator |
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| prophet | (noun) an authoritative person who divines the future | Synonyms: oracle, prophesier, seer, vaticinator |
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| (noun) someone who speaks by divine inspiration; someone who is an interpreter of the will of God | - |
| prophetess | (noun) a woman prophet | - |
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| prophylactic | (noun) contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse | Synonyms: condom, rubber, safe, safety |
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| (noun) remedy that prevents or slows the course of an illness or disease | Synonyms: preventative, preventive |
| prophylaxis | (noun) the prevention of disease | - |
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| prophyll | (noun) a plant structure resembling a leaf | - |
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| propinquity | (noun) the property of being close together | Synonyms: proximity |
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| propionaldehyde | (noun) a colorless liquid aldehyde | Synonyms: propanal |
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| propitiation | (noun) the act of placating and overcoming distrust and animosity | Synonyms: conciliation, placation |
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| (noun) the act of atoning for sin or wrongdoing (especially appeasing a deity) | Synonyms: atonement, expiation |
| propitiousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: auspiciousness |
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| propjet | (noun) an airplane with an external propeller that is driven by a turbojet engine | Synonyms: turbo-propeller plane, turboprop |
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| propman | (noun) member of the stage crew in charge of properties | Synonyms: property man, property master |
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| proponent | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocate, advocator, exponent |
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| proportion | (noun) magnitude or extent | Synonyms: dimension |
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| (noun) harmonious arrangement or relation of parts or elements within a whole (as in a design) | Synonyms: balance, proportionality |
| (noun) the quotient obtained when the magnitude of a part is divided by the magnitude of the whole | - |
| (noun) the relation between things (or parts of things) with respect to their comparative quantity, magnitude, or degree | Synonyms: ratio |
| (noun) balance among the parts of something | Synonyms: symmetry |
| proportional | (noun) one of the quantities in a mathematical proportion | - |
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| proportionality | (noun) harmonious arrangement or relation of parts or elements within a whole (as in a design) | Synonyms: balance, proportion |
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| (noun) a ratio of two quantities that is constant | - |
| proportionateness | (noun) the relation of corresponding in degree or size or amount | Synonyms: commensurateness, correspondence |
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| proposal | (noun) something proposed (such as a plan or assumption) | - |
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| (noun) the act of making a proposal | Synonyms: proposition |
| (noun) an offer of marriage | Synonyms: marriage offer, marriage proposal, proposal of marriage |
| proposer | (noun) (parliamentary procedure) someone who makes a formal motion | Synonyms: mover |
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| (noun) someone who advances a suggestion or proposal | Synonyms: suggester |
| proposition | (noun) a task to be dealt with | - |
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| (noun) (logic) a statement that affirms or denies something and is either true or false | - |
| (noun) a proposal offered for acceptance or rejection | Synonyms: proffer, suggestion |
| (noun) the act of making a proposal | Synonyms: proposal |
| (noun) an offer for a private bargain (especially a request for sexual favors) | - |
| propositus | (noun) the person immediately affected by or concerned with an action | - |
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| propoxyphene | (noun) a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive | Synonyms: Darvon, propoxyphene hydrochloride |
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| propranolol | (noun) the first beta blocker (trade name Inderal) used in treating hypertension and angina pectoris and essential tremor | Synonyms: Inderal |
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| proprietary | (noun) an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits | Synonyms: proprietorship |
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| proprietor | (noun) (law) someone who owns (is legal possessor of) a business | Synonyms: owner |
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| proprietorship | (noun) an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profits | Synonyms: proprietary |
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| proprietress | (noun) a woman proprietor | - |
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| propriety | (noun) correct or appropriate behavior | Synonyms: correctitude, properness |
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| proprioception | (noun) the ability to sense the position and location and orientation and movement of the body and its parts | - |
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| proprioceptor | (noun) special nerve endings in the muscles and tendons and other organs that respond to stimuli regarding the position and movement of the body | - |
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| proprionamide | (noun) the amide of propionic acid (C2H5CONH2) | Synonyms: propanamide |
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| props | (noun) proper respect | - |
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| propulsion | (noun) the act of propelling | Synonyms: actuation |
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| (noun) a propelling force | - |
| propyl | (noun) the monovalent organic group C3H7- obtained from propane | Synonyms: propyl group, propyl radical |
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| propylene | (noun) a flammable gas obtained by cracking petroleum; used in organic synthesis | Synonyms: propene |
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| propylthiouracil | (noun) a crystalline compound used as an antithyroid drug in the treatment of goiter | - |
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