The Collaborative International Dictionary
Meconic
Meconic \Me*con"ic\, a. [Gr. ? belonging to the poppy, fr. ? the poppy: cf. F. m['e]conique.] Pertaining to, or obtained from, the poppy or opium; specif. (Chem.), designating an acid related to aconitic acid, found in opium and extracted as a white crystalline substance.
Douglas Harper's Etymology Dictionary
meconic
in reference to an acid obtained from opium, 1819, from Greek mekonikos "of or pertaining to the poppy," from mekon "poppy" (see meconium). Related: Meconine (n.).