morphine alkaloid

(organic chemistry) A group of about twenty closely related compounds obtained from the dried latex that exudes from the seed capsule of the opium poppy Papaver somniferum.

(chemistry) any of a range of related alkaloids found in various species of the genus Nicotiana, especially Nicotiana tabacum which is cultivated for the manufacture of cigarettes

(organic chemistry) Any of various alkaloids of similar chemical structure, including harmine, harmaline, and harmalol, that function as MAOIs and are found in the seeds of Peganum harmala.

(archaic) A ptomaine.