Medical Definition of acetin
: any of three liquid acetates formed when glycerol and acetic acid are heated together:a: one C3H5(OH)2C2H3O2 containing only one acetate group that is used chiefly in the manufacture of explosives—called also monoacetinb: one C3H5(OH)(C2H3O2)2 containing two acetate groups that is used chiefly as a plasticizer and solvent—called also diacetinc: one C3H5(C2H3O2)3 containing three acetate groups that is used chiefly as a plasticizer and solvent and as a fixative in perfumes—called also triacetin
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