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adolescent[adolescent 词源字典]

adolescent: [15] The original notion lying behind both adolescent and adult is of ‘nourishment’. The Latin verb alere meant ‘nourish’ (alimentary and alimony come from it, and it is related to old). A derivative of this, denoting the beginning of an action, was alēscere ‘be nourished’, hence ‘grow’. The addition of the prefix ad- produced adolēscere.

Its present participial stem, adolēscent- ‘growing’, passed into English as the noun adolescent ‘a youth’ (the adjective appears not to have occurred before the end of the 18th century). Its past participle, adultus ‘grown’, was adopted into English as adult in the 16th century.
=> adult, alimentary, alimony, coalesce, coalition, proletarian, prolific[adolescent etymology, adolescent origin, 英语词源]