¦ adjective Chemistry another term for tetravalent.
Quadrivalent
·adj Having a valence of four; capable of combining with, being replaced by, or compared with, four monad atoms; tetravalent;
- said of certain atoms and radicals; thus, carbon and silicon are quadrivalent elements.
divalent
[d??'ve?l(?)nt]
¦ adjective Chemistry having a valency of two.
Wikipedia
Valence (chemistry)
In chemistry, the valence (US spelling) or valency (British spelling) of an element is the measure of its combining capacity with other atoms when it forms chemical compounds or molecules.
1. The disease was notably rare this season because of better pilgrims’ coverage with the quadrivalent meningococcal vaccination that was made mandatory for both external and internal pilgrims.