corticoid (n.)

"innermost layer of the skin," 1836, from Latin corium "skin, hide, leather," related to cortex "bark," scortum "skin, hide," from PIE root *sker- (1) "to cut" (compare Sanskrit krtih "hide;" Old Church Slavonic scora "skin," Russian skora "hide," kora "bark;" Welsh corwg "boat made with leather skins," all from the same root).

1944, from cortico-, combining form of corticoid, + steroid. So called because they are produced in the adrenal cortex. Related: Corticosterone.