elder (n.2)youdaoicibaDictYouDict[elder 词源字典]
type of berry tree, c. 1400, with excrescent -d- from earlier ellen, from Old English ellæn, ellærn "elderberry tree," origin unknown, perhaps related to alder, which at any rate might be the source of the -d-. Common Germanic, cognates: Old Saxon elora, Middle Low German elre, Old High German elira, German Eller, Erle. Related: Elderberry.[elder etymology, elder origin, 英语词源]