Meconin :: Meconin (n.) A substance regarded as an anhydride of meconinic acid, existing in opium and extracted as a white crystalline substance. Also erroneously called meconina, meconia, etc., as though it were an alkaloid..
Meconinic :: Meconinic (a.) Pertaining to, or designating, an acid which occurs in opium, and which may be obtained by oxidizing narcotine..