a. [f. BI- pref.2 6 + GEMINAL, f. L. geminus twin.] Existing or arranged in two pairs; spec. in Phys. applied to the corpora quadrigemina of the brain, lying beneath the cerebral hemispheres.
1836. Todd, Cycl. Anat. & Phys., I. 583/1. Their medullary fibres … enter the bigeminal bodies.
1870. Rolleston, Anim. Life, Introd. 53. The bigeminal hollow optic lobes.
