A member or supporter of an antiopium movement or organization; someone dedicated to opposing opium use.
From antiopium + -ite (a follower or member, as in 'Israelite'). Similar formation to antiopiumist but emphasizing group membership.
The -ite suffix usually means a member of a group (like 'Buddhite'), so 'antiopiumite' sounds like someone belonged to an organized movement—which many did, forming societies and publishing newspapers against opium!
Complete word intelligence in one call. Free tier — 50 lookups/day.