Acidic/əˈsɪdɪk/ Definition 1 of 3Pro Tip 1/3Sour Taste Use 'acidic' to describe foods or drinks with a sharp taste similar to lemon. The acidic flavor of the vinaigrette complemented the salad. Pro Tip 2/3Not Always Negative 'Acidic' isn't always bad. It can describe desirable flavors in food and beverages. This wine has an enjoyably acidic note. Pro Tip 3/3Physical Sensation 'Acidic' can imply a physical sensation in the mouth, like a tingle on the tongue. After the sip, I felt an acidic sting on my tastebuds.