from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Trivalent.
from The Century Dictionary.
- In chem., having combining power equivalent to that of three univalent or monad atoms of hydrogen. Nitrogen is tervalent in ammonia (NH3). Also, but less correctly, trivalent.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective chemistry
Sorry, no etymologies found.
In this work he formulated the idea that, in the numerous compounds of tervalent nitrogen, the three valence bonds of the nitrogen atom are directed towards the three corners of a tetrahedron, the fourth corner of this being occupied by the nitrogen atom.