quadrigeminous, a. [Quadri- + L. gemini twins.].
Fourfold; having four similar parts, or two pairs of similar parts. [1913 Webster]
Quadrigeminal bodies (Anat.), 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.