submillimeter

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adjective

Less than a millimeter in size.

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Meanings

adjectivesubmillimeter (not comparable)

alternative submillimetre

  1. not comparablesciencesLess than a millimeter in size.
nounsubmillimeter (plural submillimeters)

plural submillimeters · alternative submillimetre

  1. sciencesA unit or measurement that is less than a millimeter.

    The sizes vary from four to five millimeters, or with laminar resolution functional magnetic resonance imaging (lfMRI), to submillimeters.

    2022, Fouad Sabry, Brain Reading

Origin

* sub- + millimeter

Full word history & related roots →
Cite this entry
APA

submillimeter. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/submillimeter

MLA

“submillimeter.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/submillimeter. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “submillimeter,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/submillimeter.

Source: submillimeter on Wiktionary, CC BY-SA 4.0.