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. |
See also: Anaclastic
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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