follicle (n.)youdaoicibaDictYouDict[follicle 词源字典]
early 15c., in anatomy, "small sack," from Latin folliculus "a little bag," diminutive of follis "bellows, inflated ball, money-bag," from PIE *bhol-n-, suffixed form of root *bhel- (2) "to blow, swell" (see bole). Related: Follicular.[follicle etymology, follicle origin, 英语词源]