Source : Webster's Revised Unabridged Dictionary (1913)

Launce \Launce\, n.
   A lance. [Obs.]

Launce \Launce\, n. [It. lance, L. lanx, lancis, plate, scale of
   a balance. Cf. {Balance}.]
   A balance. [Obs.]

         Fortune all in equal launce doth sway.   --Spenser.

Launce \Launce\, n. (Zo["o]l.)
   See {Lant}, the fish.

Source : WordNet®

launce
     n : very small silvery eellike schooling fishes that burrow into
         sandy beaches [syn: {sand lance}, {sand launce}, {sand
         eel}]