the GNU version of the Collaborative International Dictionary of English
ad. With one leg on each side, as a man when on horseback; with the legs stretched wide apart; astraddle.
The Century Dictionary and Cyclopedia
With one leg on each side of some object; with the legs wide apart.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. with the legs stretched far apart
ad. with one leg on each side
Word Usage
"He gave me quite a lecture on the dangers of the side-saddle, and said very earnestly that women ought to ride "astride" (at that time this was a thing _incompris_ in England)."