berry blue adjective 1noun 1forms 1 adjective1 •Of a purplish-blue colour resembling that of blueberries.[recipe title] Old South Berry Blue Pie 4 cups fresh blueberries, rinsed — 2005 noun1 •A purplish-blue color resembling that of blueberriesyarn credit: Caron “Simply Quick,” 100% acrylic (85 grams, 50 yes); color: #15 Berry Blue. — 2007 formsberry blues