| protozoology | (noun) the branch of zoology that studies protozoans | - |
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| protozoon | (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoan |
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| protract | (verb) lengthen in time; cause to be or last longer | Synonyms: draw out, extend, prolong |
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| protracted | (adjective) relatively long in duration; tediously protracted | Synonyms: drawn-out, extended, lengthy, prolonged |
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| protractedly | (adverb) in a slow, leisurely or prolonged way | Synonyms: lingeringly |
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| protractible | (adjective) able to be extended | Synonyms: protractile |
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| protractile | (adjective) able to be extended | Synonyms: protractible |
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| protraction | (noun) the act of prolonging something | Synonyms: lengthening, perpetuation, prolongation |
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| (noun) the consequence of being lengthened in duration | Synonyms: continuation, lengthiness, prolongation |
| protractor | (noun) drafting instrument used to draw or measure angles | - |
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| protriptyline | (noun) tricyclic antidepressant used to treat clinical depression | - |
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| protrude | (verb) swell or protrude outwards | Synonyms: bulge, pouch |
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| (verb) bulge outward | Synonyms: bug out, bulge, bulge out, come out, pop, pop out, start |
| (verb) extend out or project in space | Synonyms: jut, jut out, project, stick out |
| protruding | (adjective) extending out above or beyond a surface or boundary | Synonyms: jutting, projected, projecting, relieved, sticking, sticking out |
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| protrusible | (adjective) capable of being thrust forward, as the tongue | Synonyms: protrusile |
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| protrusile | (adjective) capable of being thrust forward, as the tongue | Synonyms: protrusible |
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| protrusion | (noun) the act of projecting out from something | Synonyms: jut, jutting, projection |
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| (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protuberance, swelling |
| protrusive | (adjective) thrusting outward | - |
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| protuberance | (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, swelling |
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| (noun) the condition of being protuberant; the condition of bulging out | - |
| protuberant | (adjective) curving outward | Synonyms: bellied, bellying, bulbous, bulging, bulgy |
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| protuberate | (verb) form a rounded prominence | - |
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| (verb) cause to bulge out or project | - |
| proturan | (noun) any of several minute primitive wingless and eyeless insects having a cone-shaped head; inhabit damp soil or decaying organic matter | Synonyms: telsontail |
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| radioprotection | (noun) protection against harmful effects of radiation | - |
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| scleroprotein | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: albuminoid |
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| thyroprotein | (noun) a preparation made from iodinated protein and having an action similar to thyroxine | - |
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| unprotected | (adjective) lacking protection or defense | - |
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| unprotectedness | (noun) the property of being helpless in the face of attack | Synonyms: defencelessness, defenselessness |
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| unprotective | (adjective) not affording protection | - |
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