acro-youdaoicibaDictYouDict[acro- 词源字典]
word-forming element meaning "highest, topmost, at the extremities," before vowels, acr-, from Greek akro- "pertaining to an end, extreme," comb. form of akros "at the end, at the top" (see acrid).[acro- etymology, acro- origin, 英语词源]