(organic chemistry) The acyl chloride of acetic acid, CH₃COCl

(pharmacology) Synonym of para-acetylaminophenol (acetaminophen / paracetamol / tylenol)

(organic chemistry, countable) Any organic compound having one or more carbon–carbon triple bonds; an alkyne.

An oxyacetylene torch.

(pharmacology) The acetate ester of salicylic acid (aspirin)

(neuroscience) A feature of neurons that detects the presence of the neurotransmitter acetylcholine as part of neural activity.

(biochemistry) A neurotransmitter in humans and other animals. It is an ester of acetic acid and choline with chemical formula CH₃COOCH₂CH₂N⁺(CH₃)₃.

(biochemistry) An enzyme that catalyzes the hydrolysis of the neurotransmitter acetylcholine into choline and acetic acid.

(chemistry) A form of carbon black formed by the decomposition (but not by the burning) of acetylene. It is characterized by its high degree of crystalline orientation compared with other sources of carbon black.

(organic chemistry) Any acetylene (alkyne) having the triple bond attached to a terminal carbon atom; R-CC-H.