from
The Collaborative International Dictionary of English v.0.48
Calcar \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.
[1913 Webster]
2. (Zool.) A slender bony process from the ankle joint of
bats, which helps to support the posterior part of the
web, in flight.
[1913 Webster]
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.
[1913 Webster] Calcarate