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one of two folded, sacculated, glandular structures that is a diverticulum of the ductus deferens; its secretion is one of the components of semen; it normally does not store spermatozoa as was previously thought.
sem·i·nal ves·i·cle(sem'i-năl ves'i-kĕl)
gonecyst, gonecystis (gŏn′ĕ-sĭst) (gŏn-ĕ-sĭs′tĭs) [Gr. gone, seed, + kystis, a bladder]
A seminal vesicle.