Despite its questionable existence, the word "buxeous" is commonly misspelled as "buxom" by those not familiar with Middle English. The word is pronounced \ˈbək-sē-əs\ in the International Phonetic Alphabet (IPA), with the "x" sound being phonetically written as "ks." It is believed to have originated from the Old French word "buxum," meaning "obedient" or "pliant." Despite its rarity, the word can be found in several literary works, including those of Shakespeare and Chaucer.
Pert. to the box-tree.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.