twi-

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twi- prefix meaning ‘two’, ‘twice’, OE. twi-, twy- ( = OHG. zwi-, ON. tví-; rel. to TWO). Of the 45 or so OE. comps. none survived exc. (arch.) twifold, (dial.) twibill two-edged axe, mattock, twi- being gen. repl. by two-, as twofold (ME. twafald XII, OE. twifeald), two-headed (OE. twihēafdode).