NOUN (1)

1. a saddle for a woman; rider sits with both feet on the same side of the horse;


ADVERB (1)

1. on or as if on a sidesaddle;
- Example: "she rode sidesaddle"

The Collaborative International Dictionary of English v.0.48:

Sidesaddle \Side"sad`dle\, n.
   A saddle for women, in which the rider sits with both feet on
   one side of the animal mounted.
   [1913 Webster]

   Sidesaddle flower (Bot.), a plant with hollow leaves and
      curiously shaped flowers; -- called also huntsman's cup.
      See Sarracenia.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sidesaddle
    adv 1: on or as if on a sidesaddle; "she rode sidesaddle"
    n 1: a saddle for a woman; rider sits with both feet on the same
         side of the horse