Buxom

bux·om   [buhk-suhm] /ˈbʌksəm/
–adjective
1.(of a woman) full-bosomed.
2.(of a woman) healthy, plump, cheerful, and lively.

Origin:
1125–75; ME, earlier buhsum pliant, equiv. to OE būh (var. s. of būgan to bow1) + -sum -some1

—Related forms
bux·om·ly, adverb
bux·om·ness, noun


proof its a real word:
http://dictionary.reference.com/browse/buxom