Sharp or sour in taste or manner; a somewhat archaic term describing something that is acidic or having a biting quality.
From Old French 'aigre', derived from Latin 'acris' meaning sharp or sour, related to 'acerbic' and 'acid' in English.
This is an ancestor word to 'acrid' and 'acid'—they all come from the same Latin root that originally described the sharp sting of sour flavors, which our ancestors found important enough to name in almost every language!
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