rare. [f. Gr. κρυπτός hidden + ὄνομα name: cf. ANONYM.] A private or secret name.
1876. Lowell, Among my Bks., Ser. II. Dante, p. 16, note. Only a cryptonym by which heretics knew each other.
So Cryptonymous a., whose name is concealed, anonymous.
1880. Swinburne, in Fortn. Rev., Dec., 719. The cryptonymous railer for his bread.
