The Collaborative International Dictionary of English v.0.48:

Maidhood \Maid"hood\, n. [AS. maeg[eth]h[=a]d. See Maid, and
   -hood.]
   Maidenhood. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

maidhood
    n 1: the childhood of a girl [syn: girlhood, maidenhood,
         maidhood]