a cocktail made with gin or vodka and dry vermouth, usually served with a green olive or a twist of lemon peel.
Origin: 1885–90; perh. alter. of Martinez (an earlier alternate name of the drink, of disputed orig.), by back formation (taking it as pl.), or by assoc. with the vermouth manufacturer Martini, Sola & Co. (later Martini & Rossi)
1894, probably from Martini and Rossi, It. firm that makes vermouth (an ingredient of the drink). Another theory holds that it is a corruption of Martinez, California, town where the drink was said to have originated.