-onium

Chemistry.

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

QUIZZES

TAKE ROUND 2 OF OUR PSAT VOCABULARY QUIZ!

Here is our second set of teacher-selected PSAT vocabulary words. Do you know the meanings of these terms?
Question 1 of 10
advocate
to give up possession or occupancy of.
to speak or write in favor of; support or urge by argument; recommend publicly.
to pronounce or decree by judicial sentence.
TAKE THE QUIZ TO FIND OUT

Origin of -onium

extracted from ammonium

Words nearby -onium

-oma, -ome, -on, -one, -onic, -onium, -ont, -onym, -oon, -opia, -opsia
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Medical definitions for -onium

-onium

suff.

Containing a positively charged radical:carbonium.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.