-onium

Chemistry.

1. a suffix used in the names of complex cations:

   oxonium.

Word History and Origins

Origin of -onium¹

Extracted from ammonium

Example Sentences

This is a situation which agrees with no other city in all Egypt, except that which was the Onium of the later Jews.

From Project Gutenberg

This was also called Onium, and Hanes, the I�nisus of Herodotus.

From Project Gutenberg