‖Cal″car, n.; L. pl.Calcaria (#). [L., a spur, as worn on the heel, also the spur of a cock, fr. calx, calcis, the heel.] 1. (Bot.) A hollow tube or spur at the base of a petal or corolla.
2. (Zoöl.) A slender bony process from the ankle joint of bats, which helps to support the posterior part of the web, in flight.
3. (Anat.) (a) A spur, or spurlike prominence. (b) A curved ridge in the floor of the leteral ventricle of the brain; the calcar avis, hippocampus minor, or ergot.