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acrid[acrid 词源字典]

acrid: [18] Acrid is related to acid, and probably owes its second syllable entirely to that word. It is based essentially on Latin acer ‘sharp, pungent’, which, like acid, acute, oxygen, and edge, derives ultimately from an Indo-European base *ak- meaning ‘be pointed or sharp’. When this was imported into English in the 18th century, the ending -id was artificially grafted on to it, most likely from the semantically similar acid.
=> acid, acrylic, acute, edge, eglantine, oxygen, paragon[acrid etymology, acrid origin, 英语词源]