2、来自拉丁词botulus, 肠。进入法语脱落字母t, 写作boele, 进入英语插入字母w, 写作bowel. 词源同botulism.
2、bowel:  Bowel comes via Old French buel or bouel from Latin botellus ‘small intestine, sausage’, a diminutive form of botulus ‘sausage’. The term botulism ‘food poisoning’ was coined on the basis that the toxin responsible for it was originally found in sausages and other preserved meats.=> botulism
4、c. 1300, from Old French boele"intestines, bowels, innards"(12c., Modern French boyau), from Medieval Latin botellus"small intestine,"originally"sausage,"diminutive of botulus"sausage,"a word borrowed from Oscan-Umbrian, from PIE *gwet-/*geut-"intestine"(cognates: Latin guttur"throat,"Old English cwið, Gothic qiþus"belly, womb,"German kutteln"guts, chitterlings"). Greek splankhnon (from the same PIE root as spleen) was a word for the principal internal organs, which also were felt in ancient times to be the seat of various emotions. Greek poets, from Aeschylus down, regarded the bowels as the seat of the more violent passions such as anger and love, but by the Hebrews they were seen as the seat of tender affections, especially kindness, benevolence, and compassion. Splankhnon was used in Septuagint to translate a Hebrew word, and from thence early Bibles in English rendered it in its literal sense as bowels, which thus acquired in English a secondary meaning of"pity, compassion"(late 14c.). But in later editions the word often was translated as heart. Bowel movement is attested by 1874.