| protactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protoactinium |
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| protagonism | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: advocacy |
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| protagonist | (noun) a person who backs a politician or a team etc. | Synonyms: admirer, booster, champion, friend, supporter |
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| (noun) the principal character in a work of fiction | Synonyms: agonist |
| protamine | (noun) a simple protein found in fish sperm; rich in arginine; simpler in composition than globulin or albumin; counteracts the anticoagulant effect of heparin | - |
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| protanopia | (noun) dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue | Synonyms: red-blindness |
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| protea | (noun) any tropical African shrub of the genus Protea having alternate rigid leaves and dense colorful flower heads resembling cones | - |
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| protease | (noun) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis | Synonyms: peptidase, proteinase, proteolytic enzyme |
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| protection | (noun) the activity of protecting someone or something | - |
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| (noun) payment extorted by gangsters on threat of violence | Synonyms: tribute |
| (noun) kindly endorsement and guidance | Synonyms: aegis, auspices |
| (noun) the imposition of duties or quotas on imports in order to protect domestic industry against foreign competition | Synonyms: trade protection |
| (noun) a covering that is intend to protect from damage or injury | Synonyms: protective cover, protective covering |
| (noun) defense against financial failure; financial independence | Synonyms: security |
| (noun) the condition of being protected | Synonyms: shelter |
| protectionism | (noun) the policy of imposing duties or quotas on imports in order to protect home industries from overseas competition | - |
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| protectionist | (noun) an advocate of protectionism | - |
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| protectiveness | (noun) the quality of providing protection | - |
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| (noun) a feeling of protective affection | - |
| protector | (noun) a person who cares for persons or property | Synonyms: defender, guardian, shielder |
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| protectorate | (noun) a state or territory partly controlled by (but not a possession of) a stronger state but autonomous in internal affairs; protectorates are established by treaty | Synonyms: associated state |
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| protectorship | (noun) the position of protector | - |
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| protege | (noun) a person who receives support and protection from an influential patron who furthers the protege's career | - |
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| protegee | (noun) a woman protege | - |
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| protein | (noun) any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes | - |
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| proteinase | (noun) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis | Synonyms: peptidase, protease, proteolytic enzyme |
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| proteinuria | (noun) the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder | Synonyms: albuminuria |
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| proteolysis | (noun) the hydrolysis of proteins into peptides and amino acids by cleavage of their peptide bonds | - |
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| proteome | (noun) the full complement of proteins produced by a particular genome | - |
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| proteomics | (noun) the branch of genetics that studies the full set of proteins encoded by a genome | - |
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| proteosome | (noun) a form of vaccine that can be administered by an inhaler | Synonyms: proteosome vaccine |
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| protest | (noun) the act of protesting; a public (often organized) manifestation of dissent | Synonyms: dissent, objection |
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| (noun) a formal and solemn declaration of objection | Synonyms: protestation |
| (noun) the act of making a strong public expression of disagreement and disapproval | - |
| protestation | (noun) a strong declaration of protest | - |
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| (noun) a formal and solemn declaration of objection | Synonyms: protest |
| protester | (noun) someone who participates in a public display of group feeling | Synonyms: demonstrator |
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| (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, objector |
| prothalamion | (noun) a song in celebration of a marriage | Synonyms: prothalamium |
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| prothalamium | (noun) a song in celebration of a marriage | Synonyms: prothalamion |
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| prothorax | (noun) the anterior part of an insect's thorax; bears the first pair of legs | - |
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| prothrombin | (noun) a protein in blood plasma that is the inactive precursor of thrombin | Synonyms: factor II |
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| prothrombinase | (noun) coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors | Synonyms: factor X |
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| protip | (noun) an insightful bit of advice | - |
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| protirelin | (noun) hormone released by the hypothalamus that controls the release of thyroid-stimulating hormone from the anterior pituitary | Synonyms: thyrotropin-releasing factor, thyrotropin-releasing hormone, TRF, TRH |
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| protist | (noun) free-living or colonial organisms with diverse nutritional and reproductive modes | Synonyms: protistan |
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| protistan | (noun) free-living or colonial organisms with diverse nutritional and reproductive modes | Synonyms: protist |
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| protoactinium | (noun) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | Synonyms: atomic number 91, Pa, protactinium |
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| protoanthropology | (noun) the study of humans prior to the invention of writing | Synonyms: protohistory |
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| protoarchaeology | (noun) the study of prehistoric human artifacts and human fossils | Synonyms: protoarcheology |
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| protoarcheology | (noun) the study of prehistoric human artifacts and human fossils | Synonyms: protoarchaeology |
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| protoavis | (noun) most primitive avian type known; extinct bird of the Triassic having bird-like jaw and hollow limbs and breastbone with dinosaur-like tail and hind limbs | - |
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| protoceratops | (noun) small horned dinosaur | - |
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| protocol | (noun) code of correct conduct | - |
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| (noun) forms of ceremony and etiquette observed by diplomats and heads of state | - |
| (noun) (computer science) rules determining the format and transmission of data | Synonyms: communications protocol |
| protoctist | (noun) any of the unicellular protists | - |
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| protoheme | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haem, haemitin, hematin, heme |
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| protohemin | (noun) a reddish-brown chloride of heme; produced from hemoglobin in laboratory tests for the presence of blood | Synonyms: hemin |
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| protohippus | (noun) Pliocene horse approaching donkeys in size | - |
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| protohistory | (noun) the study of humans prior to the invention of writing | Synonyms: protoanthropology |
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| protology | (noun) the study of origins and first things | - |
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| protomammal | (noun) probably warm-blooded; considered direct ancestor of mammals | Synonyms: therapsid |
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| proton | (noun) a stable particle with positive charge equal to the negative charge of an electron | - |
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| protoplasm | (noun) the substance of a living cell (including cytoplasm and nucleus) | Synonyms: living substance |
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| protoplast | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: energid |
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| prototherian | (noun) primitive oviparous mammals found only in Australia and Tasmania and New Guinea | - |
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| prototype | (noun) a standard or typical example | Synonyms: epitome, image, paradigm |
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| protozoan | (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoon |
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| protozoologist | (noun) a zoologist who studies protozoans | - |
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| 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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| 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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| 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 |
| 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 | - |
| 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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