| hypolipoproteinemia | (noun) any of various disorders of lipoprotein and cholesterol metabolism that result in low levels of lipoprotein and cholesterol in the circulating blood | - |
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| hypoproteinemia | (noun) abnormally low level of protein in the blood; can indicate inadequate diet or intestinal or renal disorders | - |
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| hysterotomy | (noun) surgical incision into the uterus (as in cesarean section) | - |
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| iodoprotein | (noun) a protein that contains iodine | Synonyms: iodinated protein |
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| isoproterenol | (noun) drug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heart | Synonyms: Isuprel |
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| laparotomy | (noun) surgical incision into the abdominal wall; often done to examine abdominal organs | - |
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| lerot | (noun) dormouse of southern Europe and northern Africa | - |
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| levorotary | (adjective) rotating to the left | Synonyms: left-handed, levorotatory |
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| levorotation | (noun) rotation to the left | Synonyms: counterclockwise rotation |
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| levorotatory | (adjective) rotating to the left | Synonyms: left-handed, levorotary |
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| lipoprotein | (noun) a conjugated protein having a lipid component; the principal means for transporting lipids in the blood | - |
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| macrotus | (noun) large-eared greyish bat of southern California and northwestern Mexico | Synonyms: Macrotus californicus |
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| metaproterenol | (noun) a bronchodilator (trade name Alupent) used to treat asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects include tachycardia and shakiness | Synonyms: Alupent |
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| microtome | (noun) scientific instrument that cuts thin slices of something for microscopic examination | - |
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| microtoponym | (noun) a name of a "minor" or small natural feature (e.g., a field, path, bridge, ditch, etc.). | - |
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| microtubule | (noun) a microscopically small tubule | - |
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| necrotic | (adjective) relating to or affected by necrosis | - |
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| nephrotomy | (noun) incision into a kidney (usually to remove a kidney stone) | - |
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| nephrotoxic | (adjective) toxic to the kidney | - |
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| nephrotoxin | (noun) any toxin that affects the kidneys | - |
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| neurotic | (adjective) affected with emotional disorder | Synonyms: psychoneurotic |
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| (adjective) characteristic of or affected by neurosis | - |
| (noun) a person suffering from neurosis | Synonyms: mental case, psychoneurotic |
| neurotically | (adverb) in a neurotic manner | - |
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| neuroticism | (noun) a mental or personality disturbance not attributable to any known neurological or organic dysfunction | Synonyms: neurosis, psychoneurosis |
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| neurotoxic | (adjective) poisonous to nerves or nerve cells | - |
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| neurotoxin | (noun) any toxin that affects neural tissues | Synonyms: neurolysin |
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| neurotransmitter | (noun) a neurochemical that transmits nerve impulses across a synapse | - |
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| neurotropic | (adjective) (of a virus, toxin, or chemical) tending to attack or affect the nervous system preferentially | - |
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| neurotropism | (noun) an affinity for neural tissues | - |
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| nonprotractile | (adjective) not extensile | Synonyms: inextensible, nonextensile |
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| nucleoprotein | (noun) any of several substances found in the nuclei of all living cells; consists of a protein bound to a nucleic acid | - |
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| orotund | (adjective) (of sounds) full and rich | Synonyms: pear-shaped, rotund, round |
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| (adjective) ostentatiously lofty in style | Synonyms: bombastic, declamatory, large, tumid, turgid |
| overprotect | (verb) protect excessively | - |
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| (verb) care for like a mother | Synonyms: fuss, mother |
| overprotection | (noun) excessive protection | Synonyms: momism, overshielding |
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| overprotective | (adjective) overly protective | - |
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| parotid | (adjective) relating to or located near the parotid gland | - |
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| parotitis | (noun) inflammation of one or both parotid glands | - |
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| parrot | (noun) usually brightly colored zygodactyl tropical birds with short hooked beaks and the ability to mimic sounds | - |
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| (noun) a copycat who does not understand the words or acts being imitated | - |
| (verb) repeat mindlessly | - |
| parrotfish | (noun) gaudy tropical fishes with parrotlike beaks formed by fusion of teeth | Synonyms: polly fish, pollyfish |
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| parrotlike | (adjective) mechanically imitated or repeated without thought or understanding | - |
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| phosphoprotein | (noun) containing chemically bound phosphoric acid | - |
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| pleurothallis | (noun) any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers | - |
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| 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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| protanopic | (adjective) inability to see the color red or to distinguish red and bluish-green | Synonyms: red-blind |
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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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| protean | (adjective) taking on different forms | - |
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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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| protect | (verb) shield from danger, injury, destruction, or damage | - |
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| (verb) use tariffs to favor domestic industry | - |
| protected | (adjective) kept safe or defended from danger or injury or loss | - |
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| (adjective) guarded from injury or destruction | Synonyms: saved |
| protecting | (adjective) shielding (or designed to shield) against harm or discomfort | - |
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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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| protective | (adjective) intended or adapted to afford protection of some kind | - |
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| (adjective) showing care | - |
| (adjective) (usually followed by `of') solicitously caring or mindful | - |
| protectively | (adverb) in a protective manner | - |
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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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| proteinaceous | (adjective) relating to or of the nature of protein | - |
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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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| proteolytic | (adjective) of or relating to proteolysis | - |
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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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| proterozoic | (adjective) formed in the later of two divisions of the Precambrian era | - |
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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 | - |
| (verb) utter words of protest | - |
| (verb) affirm or avow formally or solemnly | - |
| (verb) express opposition through action or words | Synonyms: dissent, resist |
| protestant | (adjective) protesting | - |
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| 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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| proto | (adjective) indicating the first or earliest or original | - |
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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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| protogeometric | (adjective) characteristic of the earliest phase of geometric art especially in Greece | - |
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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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