onium

1 of 2

adjective

oni·um ˈō-nē-əm

: being or characterized by a usually complex cation

-onium

2 of 2

: an ion having a positive charge

hydronium

compare -ium sense 1b

Etymology

Adjective

-onium

Noun suffix

New Latin, from ammonium

First Known Use

Adjective

1905, in the meaning defined above

Time Traveler

The first known use of onium was in 1905

See more words from the same year

Style

“Onium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/onium. Accessed 14 Nov. 2024.

Copy Citation

onium

adjective

oni·um ˈō-nē-əm

: being or characterized by a usually complex cation

onium salts

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