| 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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