triamide Chem.
(ˈtraɪəmaɪd)
[f. tri- 5 a + amide.]
A compound in which the three acid hydroxyls (OH) of a tribasic acid are replaced by three amidogen groups (NH2): the hydrogen of the amidogen groups may be replaced by metals or by one or more monovalent radicals; e.g. citramide, C3H4(OH)(CO.NH2)3, the triamide of citric acid, C3H4(OH)(CO.OH)3; cyanuramide or melamine, C3N3(NH2)3, the triamide of cyanuric acid, C3N3(OH)3. For the earlier view of the structure of triamides, see quot. 1863–72.
| 1862 Miller Elem. Chem. (ed. 2) III. 427 As an instance of a secondary triamide, phenylcitramide may be given. 1863–72 Watts Dict. Chem. I. 173 Primary Triamides.—They represent 3 molecules of ammonia, in which 3 atoms of hydrogen are replaced by a triatomic acid-radicle:—Phosphamide..N3.(PO){ppp}.H6. 1866 Odling Anim. Chem. 19 C3N3(H2N)3 Cyanuric triamide. |