The Collaborative International Dictionary of English v.0.48:

Hoiden \Hoi"den\, n. [OE. hoydon a lout, rustic, OD. heyden a
   heathen, gypsy, vagabond, D. heiden, fr. OD. heyde heath, D.
   heide. See Heathen, Heath.] [Written also hoyden.]
   1. A rude, clownish youth. [Obs.] --Milton.
      [1913 Webster]

   2. A rude, bold girl; a romp. --H. Kingsley.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hoyden \Hoy"den\, n.
   Same as Hoiden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hoyden
    n 1: a girl who behaves in a boyish manner [syn: tomboy,
         romp, hoyden]