-onic, suffix Chem.
[f. -one + -ic, prob. after lactonic a. 1.]
An ending used in forming the names of acids, esp. of carboxylic acids obtained by oxidation of aldoses, as galactonic, gluconic, uronic adjs., etc. (Cf. also arsonic a. (f. arsonium), phosphonic a. (f. phosphonium), sulphonic a. (f. sulphone).)