| myocardium | (noun) the middle muscular layer of the heart wall | - |
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| nephrocalcinosis | (noun) renal lithiasis in which calcium deposits form in the renal parenchyma and result in reduced kidney function and blood in the urine | - |
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| nitrocalcite | (noun) the mineral form of calcium nitrate | - |
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| novocaine | (noun) procaine administered as a hydrochloride (trade name Novocain) | Synonyms: Novocain, procaine hydrochloride |
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| oca | (noun) South American wood sorrel cultivated for its edible tubers | Synonyms: oka, Oxalis crenata, Oxalis tuberosa |
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| ocarina | (noun) egg-shaped terracotta wind instrument with a mouthpiece and finger holes | Synonyms: sweet potato |
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| parthenocarpy | (noun) (botany) the development of a fruit without fertilization or seeds | - |
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| perfluorocarbon | (noun) a powerful greenhouse gas emitted during the production of aluminum | Synonyms: PFC |
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| photocathode | (noun) a cathode that emits electrons when illuminated | - |
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| pilocarpine | (noun) cholinergic alkaloid used in eyedrops to treat glaucoma | - |
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| piperocaine | (noun) a compound used in the form of its hydrochloride as a local or spinal anesthetic | Synonyms: Metycaine, piperocaine hydrochloride |
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| pleurocarp | (noun) a moss having the archegonium or antheridium on a short side branch rather than the main stalk | Synonyms: pleurocarpous moss |
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| podocarp | (noun) any evergreen in the Southern Hemisphere of the genus Podocarpus having a pulpy fruit with one hard seed | - |
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| procaine | (noun) a white crystalline powder (trade name Ethocaine) administered near nerves as a local anesthetic in dentistry and medicine | Synonyms: Ethocaine |
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| procarbazine | (noun) an antineoplastic drug used to treat Hodgkin's disease | - |
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| procaryote | (noun) a unicellular organism having cells lacking membrane-bound nuclei; bacteria are the prime example but also included are blue-green algae and actinomycetes and mycoplasma | Synonyms: prokaryote |
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| provocateur | (noun) a secret agent who incites suspected persons to commit illegal acts | Synonyms: agent provocateur |
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| provocation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: aggravation, irritation |
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| (noun) needed encouragement | Synonyms: incitement |
| (noun) something that incites or provokes; a means of arousing or stirring to action | Synonyms: incitation, incitement |
| pseudocarp | (noun) fruit containing much fleshy tissue besides that of the ripened ovary; as apple or strawberry | Synonyms: accessory fruit |
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| radiocarbon | (noun) a radioactive isotope of carbon | Synonyms: carbon 14 |
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| radiolocation | (noun) measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects | Synonyms: microwave radar, radar, radio detection and ranging |
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| reallocation | (noun) a new apportionment (especially a new apportionment of congressional seats in the United States on the basis of census results) | Synonyms: reallotment, reapportionment |
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| (noun) a share that has been allocated again | - |
| reciprocal | (noun) hybridization involving a pair of crosses that reverse the sexes associated with each genotype | Synonyms: reciprocal cross |
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| (noun) (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7 | Synonyms: multiplicative inverse |
| (noun) something (a term or expression or concept) that has an inverse relation to something else | - |
| reciprocality | (noun) a relation of mutual dependence or action or influence | Synonyms: reciprocity |
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| reciprocation | (noun) the act of making or doing something in return | - |
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| (noun) alternating back-and-forth movement | - |
| (noun) mutual interaction; the activity of reciprocating or exchanging (especially information) | Synonyms: give-and-take, interchange |
| relocation | (noun) the act of changing your residence or place of business | Synonyms: move |
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| (noun) the transportation of people (as a family or colony) to a new settlement (as after an upheaval of some kind) | Synonyms: resettlement |
| revocation | (noun) the act (by someone having the authority) of annulling something previously done | - |
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| (noun) the state of being cancelled or annulled | Synonyms: annulment |
| robocall | (noun) An phone call made by an automated service | - |
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| rocambole | (noun) European leek cultivated and used like leeks | Synonyms: Allium scorodoprasum, giant garlic, sand leek, Spanish garlic |
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| schizocarp | (noun) a dry dehiscent fruit that at maturity splits into two or more parts each with a single seed | - |
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| socage | (noun) land tenure by agricultural service or payment of rent; not burdened with military service | - |
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| sporocarp | (noun) specialized leaf branch in certain aquatic ferns that encloses the sori or clusters of sporangia | Synonyms: spore case |
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| streptocarpus | (noun) any of various plants of the genus Streptocarpus having leaves in a basal rosette and flowers like primroses | - |
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| subvocaliser | (noun) someone who articulates speech without uttering sounds | Synonyms: subvocalizer |
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| subvocalizer | (noun) someone who articulates speech without uttering sounds | Synonyms: subvocaliser |
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| suffocation | (noun) killing by depriving of oxygen | Synonyms: asphyxiation |
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| (noun) the condition of being deprived of oxygen (as by having breathing stopped) | Synonyms: asphyxiation |
| tapioca | (noun) granular preparation of cassava starch used to thicken especially puddings | - |
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| tetrahydrocannabinol | (noun) psychoactive substance present in marijuana | Synonyms: THC |
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| thermocautery | (noun) cautery (destruction of tissue) by heat | - |
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| thyrocalcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: calcitonin |
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| tocainide | (noun) antiarrhythmic drug (trade name Tonocard) used to treat ventricular arrhythmias when less dangerous drugs have failed | Synonyms: Tonocard |
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| translocation | (noun) (genetics) an exchange of chromosome parts | - |
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| (noun) the transport of dissolved material within a plant | - |
| unequivocalness | (noun) clarity achieved by the avoidance of ambiguity | Synonyms: unambiguity |
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| videocassette | (noun) a cassette for videotape | - |
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| vocable | (noun) a word that is spoken aloud | Synonyms: spoken word |
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| vocabulary | (noun) a language user's knowledge of words | Synonyms: lexicon, mental lexicon |
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| (noun) the system of techniques or symbols serving as a means of expression (as in arts or crafts) | - |
| (noun) a listing of the words used in some enterprise | - |
| vocal | (noun) music intended to be performed by one or more singers, usually with instrumental accompaniment | Synonyms: vocal music |
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| (noun) a short musical composition with words | Synonyms: song |
| vocalisation | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalism, vocalization, voice, vox |
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| vocaliser | (noun) a person who sings | Synonyms: singer, vocalist, vocalizer |
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| (noun) an organism that can utter vocal sounds | Synonyms: utterer, vocalizer |
| vocalism | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalisation, vocalization, voice, vox |
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| (noun) the system of vowels used in a particular language | Synonyms: vowel system |
| vocalist | (noun) a person who sings | Synonyms: singer, vocaliser, vocalizer |
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| vocalization | (noun) the sound made by the vibration of vocal folds modified by the resonance of the vocal tract | Synonyms: phonation, vocalisation, vocalism, voice, vox |
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| (noun) the use of uttered sounds for auditory communication | Synonyms: utterance |
| vocalizer | (noun) a person who sings | Synonyms: singer, vocaliser, vocalist |
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| (noun) an organism that can utter vocal sounds | Synonyms: utterer, vocaliser |
| vocalizing | (noun) the act of singing vocal music | Synonyms: singing |
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| vocation | (noun) the particular occupation for which you are trained | Synonyms: calling, career |
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| (noun) a body of people doing the same kind of work | Synonyms: occupational group |
| vocative | (noun) the case (in some inflected languages) used when the referent of the noun is being addressed | Synonyms: vocative case |
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