{ } 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. [ 1913 Webster ]