herb (n.)youdaoicibaDictYouDict[herb 词源字典]
c. 1300, erbe "non-woody plant," from Old French erbe "grass, herb, plant" (12c.), from Latin herba "grass, an herb, herbage, turf." Refashioned after Latin since 15c., but the h- was mute until 19c. Slang meaning "marijuana" is attested from 1960s.[herb etymology, herb origin, 英语词源]