rhubarbyoudaoicibaDictYouDict[rhubarb 词源字典]
rhubarb: [14] The Greeks had two words for ‘rhubarb’: rhéon, which was borrowed from Persian rēwend, and which evolved into Latin rheum, now the plant’s scientific name; and rha, which is said to have come from Rha, an ancient name of the river Volga, in allusion to the fact that rhubarb was once grown on its banks (rhubarb is native to China, and was once imported to Europe via Russia).

In medieval Latin rhubarb became known as rha barbarum ‘barbarian rhubarb, foreign rhubarb’, again with reference to the plant’s exotic origins; and in due course association with Latin rheum altered this to rheubarbarum. It passed into English via Vulgar Latin *rheubarbum and Old French reubarbe.
=> barbarian[rhubarb etymology, rhubarb origin, 英语词源]
rhubarb (n.)youdaoicibaDictYouDict
late 14c., from Old French rubarbe, from Medieval Latin rheubarbarum, from Greek rha barbaron "foreign rhubarb," from rha "rhubarb," perhaps ultimately from a source akin to Persian rewend "rhubarb" (associated in Greek with Rha, ancient Scythian name of the River Volga) + barbaron, neuter of barbaros "foreign" (see barbarian). Grown in China and Tibet, it was imported into ancient Europe by way of Russia.

Spelling altered in Medieval Latin by association with rheum. European native species so called from 1640s. Baseball slang meaning "loud squabble on the field" is from 1938, of unknown origin, said to have been first used by broadcaster Garry Schumacher. Perhaps connected with use of rhubarb as a word repeated by stage actors to give the impression of hubbub or conversation (attested from 1934).