An Etymological Dictionary of Astronomy and Astrophysics

Belonging to a thing by its very nature; true; not affected by external factors; → intrinsic brightness. Opposite to extrinsic.

Etymology (EN): Intrinsic, from M.Fr. intrinsèque “inner,” from M.L. intrinsecus “interior, internal,” from L. intrinsecus (adv.) “inwardly, on the inside,” from intra “within” + secus “alongside,” originally “following” (related to sequi “to follow”).

Etymology (PE): Darungin, from darun “in, into; within” (Mid.Pers. andarôn
“inside,” from andar, → inter-, + rôn “side, direction;” Av. ravan- “(course of a) river”) + -gin adj. suffix, contraction of âgin “filled.”