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1. any of a class of organic compounds formed by combination of an aldehyde molecule and two alcohol molecules. 2. CH3CH(OC2H5)2, a colorless, volatile liquid used as a solvent and in cosmetics.
/acÂ·eÂ·tylÂ·choÂ·line/ (ACh) (asâ³Ä-til-) (asâ³Ä-tÄl-koÂ´lÄn) the acetic acid ester of choline, which is a neurotransmitter at cholinergic synapses in the central, sympathetic, and parasympathetic nervous systems; used in the form of the chloride salt as a miotic.t is a neurotransmitter at cholinergic synapses in the central, sympathetic and parasympathetic nervous systems. It is not used clinically but it is the classical cholinergic agonist. Abbreviated ACh. acetylcholine receptors. structures located at the endorgans, e.g. at the skeletal muscle fibers.