| caryatid | (noun) a supporting column carved in the shape of a person | - |
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| chromatid | (noun) one of two identical strands into which a chromosome splits during mitosis | - |
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| hydatid | (noun) cyst filled with liquid; forms as a result of infestation by tapeworm larvae (as in echinococcosis) | - |
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| hydatidosis | (noun) infestation with larval echinococci (tapeworms) | Synonyms: echinococcosis, hydatid disease |
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| ommatidium | (noun) any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods | - |
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| spermatid | (noun) an immature gamete produced by a spermatocyte; develops into a spermatozoon | - |
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