What does "millimicron" mean?
Millimicron: The thousandish part of a micron or the millionth part of a millimeter; -- a unit of length used in measuring light waves, etc.
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00