noncarb adjective 2noun 1forms 1 adjective2 •(informal) noncarbonated“It would fill a major gap in it’s^([sic]) noncarb portfolio,” Mr. Pecoriello said last week in a note to investors. — 2007 •(informal) noncarbohydrateEven in my most stringent noncarb dieting phase I was weakened and powerless in their presence. — 2004 noun1 •(informal) A noncarbonated drink. formsnoncarbs