dart sac
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Related to dart sac: ovotestis
dart sac
a sac branching from the vagina of snails which contains a dart that is shot out prior to copulation between two snails, so that the darts from each penetrate the tissues of the other.Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005