(organic chemistry) A colourless, volatile, flammable liquid ketone, (CH₃)₂CO, used as a solvent.

An oxyacetylene torch.

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

(organic chemistry) A cyclic organic peroxide; a mixture of mostly the trimer, (((CH₃)₂CO₂)₃), (TCAP or TATP), containing a nine-membered ring and the dimer, (((CH₃)₂CO₂)₂) containing a six-membered ring; it is a high explosive manufactured from acetone and hydrogen peroxide with the aid of sulphuric acid, and has been used by amateur bomb makers.

(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.

(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.

(pharmacology) A parasympathomimetic drug that is rapidly broken down in the body, used for cataract surgery.

plural of acetylcholine receptor