[-in] n suffix [F -ine, fr. L -ina, fem. of -inus of or belonging to--more at -en] 1 a: neutral chemical compound "insulin" b: enzyme "pancreatin" c: antibiotic "penicillin"
2:
[2]-ine 1a, b "epinephrin"
3: pharmaceutical product "niacin"
[2]-in comb form [sit-in]: organized public protest by means of or in favor of: demonstration "teach-in" "love-in"