submillimeter

adjective

sub·​mil·​li·​me·​ter ˌsəb-ˈmi-lə-ˌmē-tər How to pronounce submillimeter (audio)
: being less than a millimeter in diameter or wavelength
a submillimeter particle
a submillimeter radio wave

Word History

First Known Use

1954, in the meaning defined above

Time Traveler
The first known use of submillimeter was in 1954

Dictionary Entries Near submillimeter

Cite this Entry

“Submillimeter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/submillimeter. Accessed 6 Dec. 2022.

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