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Century Dictionary and Cyclopedia

1. n. A glandular body between the eyes of a frog or toad; the interocular body, probably giving rise to the fiction of the jewel in the head of these animals.

Wiktionary

1. n. zoology A rounded organ between the eyes of the frog; the interocular gland.

GNU Webster's 1913

1. n. (Zoöl.) A rounded organ between the eyes of the frog; the interocular gland.