| blastocyst | (noun) the blastula of a placental mammal in which some differentiation of cells has occurred | Synonyms: blastodermic vessicle |
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| cyst | (noun) a small anatomically normal sac or bladderlike structure (especially one containing fluid) | Synonyms: vesicle |
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| (noun) a closed sac that develops abnormally in some body structure | - |
| dacryocyst | (noun) either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands | Synonyms: lacrimal sac, tear sac |
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| hematocyst | (noun) a cyst containing blood | Synonyms: blood cyst, hemorrhagic cyst |
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