buxom

Concise Oxford English Dictionary © 2008 Oxford University Press:
buxom /ˈbʌks(ə)m/

▶adjective (of a woman) full-figured with large breasts.

– derivatives
buxomness noun.

– origin ME (in the sense ‘compliant’, later ‘lively and good-tempered’, influenced by the assoc. of plumpness with an easy-going nature): from the stem of OE būgan ‘to bend’ (see bow2) + -some1.