\An`a*clas"tic\, a. [Gr. ? to bend back and break; to
reflect (light); ? + ? to break.]
1. (Opt.) Produced by the refraction of light, as seen
   through water; as, anaclastic curves.
2. Springing back, as the bottom of an anaclastic glass.
{Anaclastic glass}, a glass or phial, shaped like an inverted
   funnel, and with a very thin convex bottom. By sucking out
   a little air, the bottom springs into a concave form with
   a smart crack; and by breathing or blowing gently into the
   orifice, the bottom, with a like noise, springs into its
   former convex form.