quadrigeminal

Quad`ri*gem"i*nal, Quad`ri*gem"i*nous, a. Etym: [Quadri- + L. gemini twins.] Defn: Fourfold; having four similar parts, or two pairs of similar parts. 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.

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