| 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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