alkaloid
Concise Oxford English Dictionary © 2008 Oxford University Press:
alkaloid /ˈalkəlɔɪd/
▶noun Chemistry any of a class of nitrogenous organic compounds of plant origin which have pronounced physiological actions on humans.
'alkaloid' also found in these Oxford entries:
caffeine
- ephedrine
- ergotamine
- hyoscine
- jaborandi
- pilocarpine
- psilocybin
- reserpine
- strychnine

