What does cholinergic mean?
Cholinergic is an adjective from neuroscience and pharmacology describing anything that involves, produces, or responds to acetylcholine, one of the body's most important chemical messengers. A 'cholinergic neuron' is one that releases acetylcholine to signal its neighbour; 'cholinergic receptors' are the molecular docking sites on cells that receive that signal. The word appears constantly in discussions of the parasympathetic nervous system — which governs rest-and-digest functions — and at the neuromuscular junction, where every voluntary muscle movement begins with a cholinergic signal. It also carries clinical weight: Alzheimer's disease involves the loss of cholinergic neurons in the brain, and organophosphate poisoning produces an overwhelming 'cholinergic crisis'. The term derives from 'choline', the compound from which acetylcholine is made, whose name ultimately comes from the Greek word for bile. Though technical, cholinergic is essential vocabulary for anyone reading about memory, muscle control, or toxicology.
(Physiology) Of or relating to nerve cells or fibres that use acetylcholine as their neurotransmitter.
"Cholinergic fibres innervate the sweat glands and stimulate sweating."
Standard usage in neuroscience and anatomy texts.
(Pharmacology) Denoting a drug or agent that mimics or enhances the actions of acetylcholine at its receptors.
"Pilocarpine is a cholinergic drug used to treat dry mouth."
Sometimes extended to mean 'producing effects like acetylcholine' more broadly than strict receptor-level mimicry.
The word 'cholinergic' literally traces back to the Greek word for bile — even though acetylcholine has nothing to do with bile itself.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cholinergic
Cholinergic derives from 'choline', the nitrogenous compound named in the mid-19th century after the Greek 'kholē' meaning bile, combined with the suffix '-ergic', from Greek 'ergon' (work), indicating activation or action upon something. The term was coined in the 20th century alongside 'adrenergic' as physiologists identified the specific neurotransmitters used by different classes of nerve fibres. Its Greek root 'kholē' also gives us cholesterol, melancholy, and bilious — all originally connected with bile.
Related word forms
How cholinergic is actually used
A technical term used almost exclusively in medicine, neuroscience, pharmacology, and physiology. Rarely encountered in general prose except in science journalism about Alzheimer's research, pesticides, or nerve agents. In casual speech it would sound jarringly formal.
Easily confused with cholinergic
Adrenergic describes nerves that use adrenaline (epinephrine) or noradrenaline as their transmitter, whereas cholinergic refers to those using acetylcholine.
Choleric is an old temperament term meaning irritable or hot-tempered (from bile), while cholinergic is a physiological term relating to acetylcholine — despite sharing the same Greek root for bile.