trigonelline
noun
trig·o·nel·line
| \ ˌtrig-ə-ˈnel-ˌēn
, -ən
\
, -ən
\
Medical Definition of trigonelline
: a crystalline alkaloid C7H7NO2 obtained especially from the seeds of fenugreek and found in the urine (as after ingestion of nicotinic acid)