Source : Webster's Revised Unabridged Dictionary (1913)

Foundling \Found"ling\, n. [OE. foundling, fundling; finden to
   find + -ling; cf. f["u]ndling, findling. See {Find}, v. t.,
   and {-ling}.]
   A deserted or exposed infant; a child found without a parent
   or owner.

   {Foundling hospital}, a hospital for foundlings.

Source : WordNet®

foundling
     n : a child who has been abandoned and whose parents are unknown
         [syn: {abandoned infant}]