Calcar /(?)/

1. A kind of oven, or reverberatory furnace, used for the calcination of sand and potash, and converting them into frit. (Glass manuf.)

pl. Calcaria

1. A hollow tube or spur at the base of a petal or corolla. (Bot.)
2. A slender bony process from the ankle joint of bats, which helps to support the posterior part of the web, in flight. (Zool.)
3. A spur, or spurlike prominence. (Anat.)