|ər(ˌ)gōˌthīˈōnēˌēn, -īˈän-, -nēə̇n noun
Etymology: International Scientific Vocabulary ergo- + thion- + -eine; originally formed as French ergothionéine
: a crystalline betaine HSC 3 H 2 N 2 CH 2 CH[N(CH 3 ) 3 ] + COO - derived from a mercapto-histidine and found especially in ergot and blood