SOUR'NESS, noun 1. Acidity; sharpness to the taste; tartness; as the sourness of vinegar or of fruit. sourness being one of those simple ideas which one cannot describe. 2. Asperity; harshness of temper. Take care that no sourness and moroseness mingle with our seriousness of mind. SOUR'-SOP, noun A plant, the annona muricata. The custard apple.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI