a. [f. L. acidul-us sourish + -OUS.] Slightly sour, sourish, sub-acid. Also fig. Sour-tempered.
1769. Buchan, Dom. Med., liv. (1826), 265. Acidulous chalybeate waters.
1796. Burke, Lett. Noble Lord, Wks. VIII. 44. Whatever in his pedigree has been dulcified by an exposure to the influence of heaven in a long flow of generations, from the hard acidulous, metallick tincture of the spring.
1830. Lindley, Nat. Syst. Bot., 44. The fruit of a species of Sauranja is said to be acidulous, and to resemble Tomatoes in flavour.
1860. Piesse, Lab. Chem. Wonders, 82. Gold is not easily acted upon by acidulous agents.
1865. Carlyle, Fredk. Gt., IX. XX. x. 179. Towards the middle of March, he becomes specially gloomy and acidulous.
