-in

I. noun suffix Etymology: French -ine, from Latin -īna, feminine of -īnus of or belonging to — more at -en 1. a. neutral chemical compound <

insulin

> b. enzyme <

pancreatin

> c. antibiotic <

penicillin

> 2. -ine II,1a, b <

epinephrin

> 3. pharmaceutical product <

niacin

> II. noun combining form Etymology: sit-in organized public protest by means of or in favor of ; demonstration <

teach-in

> <

love-in

>