Acetylcysteine

Part of speech: noun

Pronunciation: /ˌas.ɪ.tʌɪlˈsɪ.stɪ.iːn/

Definitions

1. A medication used to treat acetaminophen poisoning and to help clear mucus in respiratory conditions
2. An agent administered to counteract liver damage from overdose of acetaminophen and to loosen mucus in airways
3. A compound given to prevent toxicity from paracetamol overdose and to aid in thinning mucus in the lungs

Etymology: Acetylcysteine is a compound word built from its two parts: "acetyl," the chemical group derived from acetic acid (itself linked to vinegar, from Latin "acetum," sour), and "cysteine," an amino acid whose name comes from "cystine," the substance first isolated from kidney stones and named for the Greek "kystis," bladder. The name is therefore a chemist's label rather than an old word with a folk history, and it simply describes the molecule: cysteine with an acetyl group attached. The compound's medical use is what gives it a more memorable story. The acetyl group is attached to cysteine to make the molecule more stable and easier to absorb, and once in the body it helps replenish glutathione, the substance the liver uses to neutralise a toxic byproduct of paracetamol (acetaminophen). That connection explains why a name built from two chemical terms became attached to an antidote.