Of, relating to, or resembling lemon or citrus; having a tart or sour quality like citrus fruits.
From Latin citreus (of citrus) plus the English adjectival suffix -ous. Used primarily in older botanical and poetic texts; largely superseded by 'citric' and 'citrus' in modern usage.
Citreous is another archaic cousin of citric—English once had multiple competing words for 'citrus-like,' and we gradually standardized on just a few. It's like evolution happening in real time with language.
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