-onium

Chemistry.

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

Origin of -onium

extracted from ammonium

Words nearby -onium

-oma, -ome, -on, -one, -onic, -onium, -ont, -onym, -oon, -opia, -opsia

Medical definitions for -onium

-onium

suff.

Containing a positively charged radical:carbonium.