Source : Webster's Revised Unabridged Dictionary (1913)

Aplysia \A*plys"i*a\, n. [Gr. ? a dirty sponge, fr. ? unwashed;
   'a priv. + ? to wash.] (Zo["o]l.)
   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.

Source : WordNet®

Aplysia
     n : type genus of the family Aplysiidae [syn: {genus Aplysia}, {Tethys},
          {genus Tethus}]