2 definitions found From WordNet (r) 2.0 [wn]: acidulate verb: make sour or more sour [syn: {sour}, {acidify}, {acetify}] [ant: {sweeten}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Acidulate \A*cid"u*late\, verb (used with an object) [imp. & p. p. {Acidulated}; p. pr. & vb. n. {Acidulating}.] [Cf. F. aciduler. See {Acidulous}.] To make sour or acid in a moderate degree; to sour somewhat. --Arbuthnot.

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