CONCHIOLIN

noun

also con·chy·o·lin käŋˈkīələ̇n also kȯŋ-

( -s )

Etymology: conchiolin from conch- + -i- + -ol + -in; conchyolin alteration of conchiolin

: a scleroprotein forming the organic basis of mollusk shells (as mother-of-pearl) — see nacre 2