Sweet or pleasant; charming in a mild or gentle way.
From Latin 'dulcis' (sweet) with the adjectival suffix '-id.' This is a rare or archaic formation that never became as common as 'dulcet' in English.
English had so many ways to say 'sweet'—dulcid, dulcet, dulce, sweet itself—that you wonder if our ancestors got tired of using the same word over and over!
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