What is the meaning of Calcar?

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

A spur-like projection.

spur (equestrian, or of a cock)

to press (grapes, etc.)

(Can we verify this sense?) to base a work on (a previous one)

(Can we verify this sense?) to copy a work

in arthropods, a mobile process similar to a spike

in certain insects, the strongest spur located in the tibia

to trace, copy (copy by means of carbon paper or tracing paper)

calcar (a spur-like projection)

Source: wiktionary.org

See also