O.E.
twelf, lit. "two left" (over ten), from P.Gmc.
*twa-lif-, a compound of the root of
two +
*lif-, root of the verb
leave (see
eleven). Cf. O.S.
twelif, O.N.
tolf, O.Fris.
twelef, M.Du.
twalef, Du.
twaalf, O.H.G.
zwelif, Ger.
zwölf, Goth.
twalif. Outside Gmc., an analogous formation is Lith.
drylika, with second element
-lika "left over."