callum

Etymology
, but possibly derived from (perhaps via suffixed zero-grade ); see also 🇨🇬, 🇨🇬, 🇨🇬.

Noun

 * 1) A hard or thick substance.
 * 2) The hardened, thick skin upon animal bodies, hide.
 * 3) The hard skin or flesh of plants.
 * 4) The hard covering of soil.
 * 5) A callus, induration.
 * 6)  Hardness, callousness, insensibility, stupidity.