Enter a clue or pattern or both:

The Clue

Wavelength unit (8 letter answer)

The Answer

ANGSTROM

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Notes

The answer ANGSTROM is so rare that it appears less than once every 2500 puzzles.

Definition

ANGSTROM as a noun:

1. (angstrom, angstrom unit, A) = a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation