| 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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| zoological | (adjective) of or relating to animals or animal groups | - |
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| (adjective) concerning the study of animals and their classification and properties | - |
| 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 |
| (verb) move along very quickly | Synonyms: whizz, whizz along, zoom along |
| (verb) move with a low humming noise | - |
| (verb) rise rapidly | Synonyms: soar, soar up, soar upwards, surge |
| 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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| zoonotic | (adjective) of or relating to or constituting zoonosis | - |
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| zoophagous | (adjective) (of animals) carnivorous | Synonyms: flesh-eating, meat-eating |
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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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| zucchini | (noun) small cucumber-shaped vegetable marrow; typically dark green | Synonyms: courgette |
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| (noun) marrow squash plant whose fruit are eaten when small | Synonyms: courgette |
| zumbooruck | (noun) a camel cavalry used in the early modern era by Arab, Afghan, Persian, and Indian armies | Synonyms: camel cavalry, zamboorak, zamburak, zamburek, zumbooruk |
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| zumbooruk | (noun) a camel cavalry used in the early modern era by Arab, Afghan, Persian, and Indian armies | Synonyms: camel cavalry, zamboorak, zamburak, zamburek, zumbooruck |
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| zwieback | (noun) slice of sweet raised bread baked again until it is brown and hard and crisp | Synonyms: Brussels biscuit, rusk, twice-baked bread |
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| zydeco | (noun) music of southern Louisiana that combines French dance melodies with Caribbean music and blues | - |
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| zygodactyl | (adjective) (of bird feet) having the first and fourth toes directed backward the second and third forward | - |
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| zygoma | (noun) the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone | Synonyms: arcus zygomaticus, zygomatic arch |
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| zygomatic | (adjective) of or relating to the cheek region of the face | - |
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| (noun) the arch of bone beneath the eye that forms the prominence of the cheek | Synonyms: cheekbone, jugal bone, malar, malar bone, os zygomaticum, zygomatic bone |
| zygomorphic | (adjective) capable of division into symmetrical halves by only one longitudinal plane passing through the axis | Synonyms: bilaterally symmetrical, zygomorphous |
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| zygomorphous | (adjective) capable of division into symmetrical halves by only one longitudinal plane passing through the axis | Synonyms: bilaterally symmetrical, zygomorphic |
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| zygospore | (noun) a plant spore formed by two similar sexual cells | - |
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| zygote | (noun) (genetics) the diploid cell resulting from the union of a haploid spermatozoon and ovum (including the organism that develops from that cell) | Synonyms: fertilized ovum |
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| zygotene | (noun) the second stage of the prophase of meiosis | - |
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| zygotic | (adjective) of or relating to a zygote | - |
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| zymase | (noun) a complex of enzymes that cause glycolysis; originally found in yeast but also present in higher organisms | - |
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| zymogen | (noun) any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active | Synonyms: proenzyme |
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| zymoid | (adjective) resembling an enzyme | - |
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| zymology | (noun) the branch of chemistry concerned with fermentation (as in making wine or brewing or distilling) | Synonyms: zymurgy |
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| zymolysis | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermentation, fermenting, zymosis |
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| zymolytic | (adjective) of or relating to or causing fermentation | Synonyms: zymotic |
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| zymosis | (noun) (medicine) the development and spread of an infectious disease (especially one caused by a fungus) | - |
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| (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermentation, fermenting, zymolysis |
| zymotic | (adjective) relating to or caused by infection | - |
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| (adjective) of or relating to or causing fermentation | Synonyms: zymolytic |
| zymurgy | (noun) the branch of chemistry concerned with fermentation (as in making wine or brewing or distilling) | Synonyms: zymology |
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