adjective, sour·er, sour·est.
verb (used without object)
verb (used with object)
Origin of sour
Examples from the Web for sourness
This will correct any tendency to sourness, and make the yeast more brisk.Directions for Cookery, in its Various Branches|Eliza Leslie
You found that, in two experiences, hardness and greenness in apples went together with sourness.Man's Place in Nature and Other Essays|Thomas Henry Huxley
You found that, in two experiences, hardness and greenness in apples go together with sourness.
Nevertheless, she displayed no prudery, no sourness, in the practice of her peculiar virtue.Sentimental Education Vol 1|Gustave Flaubert
It was to him the one smart of sourness in her charm as a woman.Diana of the Crossways, Complete|George Meredith