COG  . (r) (From' an older cogge, a word which appears in various forms in

Teutonic languages, as in O . Ger. kogge or kocke, and also in Romanic, as in O . Fr. cogue, or coque, from which the Eng . " cock-boat " is derived; the connexion between the Teutonic and the Romanic forms is obscure), a broadly built, round-shaped ship, used as a trader and also as a ship of war till the 15th century . (2) (A word of obscure origin, possibly connected with Fr. coche, and Ital. cocca, a notch; the Celtic forms cog and cocas come from the English), a tooth in a series of teeth, morticed on to, or. cut out of the circumference of a wheel, which works with the tooth in a corresponding series on another wheel (see MECHANICS) . (3) (Also of quite obscure origin), a slang term for a form of cheating at dice . The early uses of the word show that this was done not by " loading " the dice, as the modern use of the expression of " cogged dice " seems to imply, but by sleight of hand in directing the fall or in changing the dice .