astraddle

from WordNet (r) 3.0 (2006)

astraddle
    adv 1: with one leg on each side; "she sat astride the chair"
           [syn: {astride}, {astraddle}]

from The Collaborative International Dictionary of English v.0.48

Astraddle \A*strad"dle\, adv. [Pref. a- + straddle.]
   In a straddling position; astride; bestriding; as, to sit
   astraddle a horse.
   [1913 Webster]