Calcar

Part of speech: noun (n.)

A kind of oven, or reverberatory furnace, used for the calcination of sand and potash, and converting them into frit. Ure.

Part of speech: noun (n.)

1. A hollow tube or spur at the base of a petal or corolla.

2. A slender bony process from the ankle joint of bats, which helps to support the posterior part of the web, in flight.

3. A spur, or spurlike prominence.

4. A curved ridge in the floor of the leteral ventricle of the brain; the calcar avis, hippocampus minor, or ergot.