1.
Fourfold; having four similar parts, or two pairs of similar parts.
Quadrigeminal bodies, two pairs of lobes, or elevations, on the dorsal side of the midbrain of most mammals; the optic lobes. The anterior pair are called the nates, and the posterior the testes.
Origin: Quadri- + L. Gemini twins.
Source: Websters Dictionary
(01 Mar 1998)