Source : Webster's Revised Unabridged Dictionary (1913)

Pickaninny \Pick"a*nin`ny\, n.; pl. {Pickaninnies}. [Cf. Sp.
   peque[~n]o little, young.]
   A small child; especially, a negro or mulatto infant. [U.S. &
   West Indies]

Source : WordNet®

pickaninny
     n : (offensive) a Black child [syn: {piccaninny}, {picaninny}]