avuncular (adj.)youdaoicibaDictYouDict[avuncular 词源字典]
1789, from Latin avunculus "maternal uncle," diminutive of avus (see uncle) + -ar. Used humorously for "of a pawnbroker" (uncle was slang for "pawnbroker" from c. 1600 through 19c.).
My only good suit is at present under the avuncular protection. ["Fraser's Magazine," 1832]
[avuncular etymology, avuncular origin, 英语词源]