GNU Collaborative International Dictionary of English

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1.       
   ‖Aplysia , n. [Gr.  a dirty sponge, fr.  unwashed; ἀ priv. +  to wash.] (Zool.) A genus of marine mollusks of the order Tectibranchiata; the sea hare. Some of the species when disturbed throw out a deep purple liquor, which colors the water to some distance. See Illust. in Appendix.
   1913 Webster