the.com/opioid

means A drug, natural or synthetic, that relieves pain by binding to the same receptors in the brain and body that our own natural painkillers use.

from Built from 'opium', the ancient poppy drug whose name traces back through Latin to Greek 'opion' (poppy juice), plus the suffix '-oid' meaning 'resembling' or 'like'. The word was coined in the 20th century to describe lab-made and semi-synthetic compounds that act like opium's active ingredients without necessarily coming from the poppy itself — a chemical family united not by origin but by the locks they pick.