Dictionary.net

• An eye-like epiphysis of lampreys, the pineal body of other Vertebrates.

1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.

• [Greek] Appl. an eye-like epiphysis of lampreys, the pineal body of other Vertebrates (zool.).

1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth