triˈnitrideChem. [f. tri- 5 + nitrogen + -ide.] A compound formed from hydrazoic acid or azoimide, HN3, by replacement of the hydrogen by a metal; as sodium trinitride, NaN3. 1911Jrnl.Chem.Soc. C. ii. 693 Corrosion of some metals in Sodium Trinitride Solution.