Origin: Greek prefix anti-
Anticholinergic has 4 different meanings across 2 categories:
a substance that opposes or blocks the action of acetylcholine
Any of a class of drugs, typically used to treat various disorders and some forms of poisoning, which inhibit the physiological action of acetylcholine at a receptor site
inhibiting or blocking the action of acetylcholine at a receptor site
"anticholinergic drugs"
That inhibits the physiological action of acetylcholine at a receptor site