'Tomboy' definitions:

Definition of 'tomboy'

From: WordNet
noun
A girl who behaves in a boyish manner [syn: tomboy, romp, hoyden]

Definition of 'Tomboy'

From: GCIDE
  • Tomboy \Tom"boy`\, n. [Tom (for Thomas, L. Thomas, fr. Gr. ? )+ boy.] A romping girl; a hoiden. [Colloq.] --J. Fletcher. [1913 Webster]

Synonyms of 'tomboy'

From: Moby Thesaurus