onium- root words — words with the onium- root

The root onium- comes from Modern Latin onium, meaning cation (on the model of ammonium). 3 words in Dendril are built from it, including hydronium, oxonium, sulfonium. Dendril shows them on a free interactive word map — no signup, no ads.

Words that use the onium- root

Explore words with onium- — words containing the onium- root and sharing its sense of "cation (on the model of ammonium)". Examples include hydronium, oxonium, sulfonium. Click any word to see its own roots, definition, and related words.

What does onium- mean?

The onium- root means cation (on the model of ammonium), from Modern Latin onium. Recognizing it helps you decode and remember the many English words built on this root.