Definify.com
Webster 1913 Edition
Protopine
Pro′to-pine
,Noun.
[
Proto-
+ opium
.] (Chem.)
An alkaloid found in opium in small quantities, and extracted as a white crystalline substance.
Definition 2024
protopine
protopine
English
Noun
protopine (usually uncountable, plural protopines)
- (biochemistry) A benzylisoquinoline alkaloid occurring in plants of the Papaveraceae family that acts as an opioid analgesic.