Definitions
from The Century Dictionary.
- Beyond the boundaries of the visible spectrum: said of lines or bands lying in the infra-red or ultra-violet regions.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective colorimetry Producible by a combination of
wavelengths but not by any singlewavelength .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
extra- + spectral
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