noun, plural no-nos, no-no's. Informal.
Origin of no-no
Examples from the Web for nono
At the ninth mile is the Ponte di Nono, a magnificent old bridge with seven lofty arches of lapis-gabinus.Walks in Rome|Augustus J.C. Hare
Nono: the lingering flames of the auto-da-fe are reserved for the Marquis dOrsini!Wagner, the Wehr-Wolf|George W. M. Reynolds
She cried over the letter, and over the signature that she was his loving Nono, but she mailed it with a dancing heart.
And with all the interest of their old days of intimacy she asked eagerly: "Nono, is he handsome?"
Its awful mean to tell itbut Ive got myself to look out foroh, nono!The Luminous Face|Carolyn Wells
British Dictionary definitions for nono
Word Origin and History for nono
1942, from reduplication of no.