Crab's eyes

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masses of calcareous matter found, at certain seasons of the year, on either side of the stomach of the European crawfishes, and formerly used in medicine for absorbent and antacid purposes; the gastroliths.

See also: Crab

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The publisher insisted on a more humane way to dispatch the creatures: applying a lethal electric shock on a spot between the crab's eyes with metal prods.
You had to be cautious: waiting until 'first it begins to sparkle like crab's eyes, then like fish's eyes, and lastly it boils up like pearls innumerable, spinning and waving about'.
A crab's eyes are at the end of long stalks so he can see enemies better.