| razorbill | (noun) black-and-white northern Atlantic auk having a compressed sharp-edged bill | Synonyms: Alca torda, razor-billed auk |
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| razorblade | (noun) a blade that has very sharp edge | - |
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| rebozo | (noun) a long woolen or linen scarf covering the head and shoulders (also used as a sling for holding a baby); traditionally worn by Latin-American women | - |
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| rhizoctinia | (noun) any fungus now or formerly belonging to the form genus Rhizoctinia | - |
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| rhizoid | (noun) any of various slender filaments that function as roots in mosses and ferns and fungi etc | - |
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| rhizome | (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rootstalk, rootstock |
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| rhizomorph | (noun) a dense mass of hyphae forming a root-like structure characteristic of many fungi | - |
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| rhizopod | (noun) protozoa characterized by a pseudopod | Synonyms: rhizopodan |
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| rhizopodan | (noun) protozoa characterized by a pseudopod | Synonyms: rhizopod |
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| rhizopus | (noun) any of various rot causing fungi of the genus Rhizopus | - |
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| rhizotomy | (noun) surgical procedure in which spinal nerve roots are cut; done (anterior roots) to relieve intractable pain or (posterior roots) to stop severe muscle spasms | - |
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| scherzo | (noun) a fast movement (usually in triple time) | - |
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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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| schizogony | (noun) asexual reproduction by multiple fission; characteristic of many sporozoan protozoans | - |
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| schizoid | (noun) characterized by symptoms similar to but less severe than schizophrenia | Synonyms: schizotypal personality |
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| schizopetalon | (noun) a dainty South American annual having deeply pinnatifid leaves and racemes of fringed almond-scented purple-white flowers | Synonyms: Schizopetalon walkeri |
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| schizophrenia | (noun) any of several psychotic disorders characterized by distortions of reality and disturbances of thought and language and withdrawal from social contact | Synonyms: dementia praecox, schizophrenic disorder, schizophrenic psychosis |
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| schizophrenic | (noun) someone who is afflicted with schizophrenia | - |
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| schizothymia | (noun) resembling schizophrenia but remaining within the bounds of normality | - |
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| scorzonera | (noun) long black salsify | Synonyms: black salsify |
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| (noun) perennial south European herb having narrow entire leaves and solitary yellow flower heads and long black edible roots shaped like carrots | Synonyms: black salsify, Scorzonera hispanica, viper's grass |
| scyphozoan | (noun) any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle | - |
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| spermatozoan | (noun) the male reproductive cell; the male gamete | Synonyms: sperm, sperm cell, spermatozoon |
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| spermatozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: antherozoid |
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| spermatozoon | (noun) the male reproductive cell; the male gamete | Synonyms: sperm, sperm cell, spermatozoan |
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| sporozoan | (noun) parasitic spore-forming protozoan | - |
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| sporozoite | (noun) one of the minute active bodies into which sporozoans divide in one stage of their life cycle | - |
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| sulfamethoxazole | (noun) a sulfonamide (trade name Gantanol) used to treat infections (especially infections of the urinary tract) | Synonyms: Gantanol |
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| sulfisoxazole | (noun) a sulfonamide (trade name Gantrisin) used to treat infections of the urinary tract | Synonyms: Gantrisin |
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| terazosin | (noun) antihypertensive drug (trade name Hytrin) used to treat high blood pressure | Synonyms: Hytrin |
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| thiabendazole | (noun) an antifungal agent and anthelmintic | - |
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| tolazoline | (noun) vasodilator that is used to treat spasms of peripheral blood vessels (as in acrocyanosis) | - |
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| trapezohedron | (noun) a polyhedron whose faces are trapeziums | - |
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| trapezoid | (noun) the wrist bone between the trapezium and the capitate bones | Synonyms: os trapezoideum, trapezoid bone |
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| (noun) a quadrilateral with two parallel sides | - |
| trazodone | (noun) oral antidepressant (trade name Desyrel) that is a nontricyclic drug used as a sedative | Synonyms: Desyrel, trazodone hydrochloride |
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| triazolam | (noun) a form of benzodiazepine (trade name Halcion) frequently prescribed as a sleeping pill; usually given to people who have trouble falling asleep | Synonyms: Halcion |
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| trichobezoar | (noun) a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur) | Synonyms: hair ball, hairball |
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| trophozoite | (noun) a sporozoan in the active feeding stage of its life cycle | - |
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| vizor | (noun) a brim that projects to the front to shade the eyes | Synonyms: bill, eyeshade, peak, visor |
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| (noun) a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face | Synonyms: visor |
| zoanthropy | (noun) the delusion that you have assumed the form of an animal | - |
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| zoarium | (noun) a colony of zooids. | - |
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| zodiac | (noun) (astrology) a circular diagram representing the 12 zodiacal constellations and showing their signs | - |
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| (noun) a belt-shaped region in the heavens on either side to the ecliptic; divided into 12 constellations or signs for astrological purposes | - |
| zombi | (noun) several kinds of rum with fruit juice and usually apricot liqueur | Synonyms: zombie |
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| (noun) a dead body that has been brought back to life by a supernatural force | Synonyms: living dead, zombie |
| (noun) someone who acts or responds in a mechanical or apathetic way | Synonyms: automaton, zombie |
| (noun) a god of voodoo cults of African origin worshipped especially in West Indies | Synonyms: snake god, zombie |
| (noun) (voodooism) a spirit or supernatural force that reanimates a dead body | Synonyms: zombi spirit, zombie, zombie spirit |
| zombie | (noun) several kinds of rum with fruit juice and usually apricot liqueur | Synonyms: zombi |
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| (noun) a dead body that has been brought back to life by a supernatural force | Synonyms: living dead, zombi |
| (noun) someone who acts or responds in a mechanical or apathetic way | Synonyms: automaton, zombi |
| (noun) a god of voodoo cults of African origin worshipped especially in West Indies | Synonyms: snake god, zombi |
| (noun) (voodooism) a spirit or supernatural force that reanimates a dead body | Synonyms: zombi, zombi spirit, zombie spirit |
| zona | (noun) (anatomy) any encircling or beltlike structure | Synonyms: zone |
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| zone | (noun) (anatomy) any encircling or beltlike structure | Synonyms: zona |
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| (noun) a locally circumscribed place characterized by some distinctive features | - |
| (noun) an area or region distinguished from adjacent parts by a distinctive feature or characteristic | - |
| (noun) any of the regions of the surface of the Earth loosely divided according to latitude or longitude | Synonyms: geographical zone |
| zoning | (noun) dividing an area into zones or sections reserved for different purposes such as residence and business and manufacturing etc | - |
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| zonula | (noun) small beltlike zone | Synonyms: zonule |
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| zonule | (noun) small beltlike zone | Synonyms: zonula |
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| zoo | (noun) the facility where wild animals are housed for exhibition | Synonyms: menagerie, zoological garden |
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| zooecdysone | (noun) The term 'zooecdysone' refers to the molting hormones of insects. | - |
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| zooerastia | (noun) sexual activity between a person and an animal | Synonyms: bestiality, sodomy, zooerasty |
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| zooerasty | (noun) sexual activity between a person and an animal | Synonyms: bestiality, sodomy, zooerastia |
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| zooflagellate | (noun) flagellate protozoan lacking photosynthesis and other plant-like characteristics | Synonyms: zoomastigote |
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| zooid | (noun) one of the distinct individuals forming a colonial animal such as a bryozoan or hydrozoan | - |
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| zoolatry | (noun) the worship of animals | Synonyms: animal-worship |
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| zoologist | (noun) a specialist in the branch of biology dealing with animals | Synonyms: animal scientist |
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| zoology | (noun) the branch of biology that studies animals | Synonyms: zoological science |
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| (noun) all the animal life in a particular region or period | Synonyms: fauna |
| zoom | (noun) the act of rising upward into the air | Synonyms: soar |
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| (noun) a rapid rise | Synonyms: rapid climb, rapid growth |
| zoomastigote | (noun) flagellate protozoan lacking photosynthesis and other plant-like characteristics | Synonyms: zooflagellate |
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| zoomorphism | (noun) the attribution of animal forms or qualities to a god | - |
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| zoonosis | (noun) an animal disease that can be transmitted to humans | Synonyms: zoonotic disease |
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| zoophagy | (noun) The quality of being an animal that eats meat as the main part of its diet. | Synonyms: carnivorousness |
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| zoophilia | (noun) a sexual attraction to animals | Synonyms: zoophilism |
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| zoophilism | (noun) a sexual attraction to animals | Synonyms: zoophilia |
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| zoophobia | (noun) a morbid fear of animals | - |
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| zoophyte | (noun) any of various invertebrate animals resembling a plant such as a sea anemone or coral or sponge | - |
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| zooplankton | (noun) animal constituent of plankton; mainly small crustaceans and fish larvae | - |
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| zoopsia | (noun) visual hallucination of animals; sometimes occurring in delirium tremens | - |
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| zoospore | (noun) an asexual spore of some algae and fungi that moves by means of flagella | - |
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| zootoxin | (noun) a toxin resembling bacterial toxins in its antigenic properties that is found in the fluids of certain animals | Synonyms: animal toxin |
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| zori | (noun) a sandal attached to the foot by a thong over the toes | Synonyms: pusher |
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| zoril | (noun) muishond of northern Africa | Synonyms: Ictonyx frenata |
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| zoster | (noun) eruptions along a nerve path often accompanied by severe neuralgia | Synonyms: herpes zoster, shingles |
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| zoysia | (noun) any of several creeping grasses of the genus Zoysia | - |
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