| spectra | Plural of spectrum. Origin: L. (05 Mar 2000) |
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| spectral | 1. Of or pertaining to a specter; ghosty. "He that feels timid at the spectral form of evil is not the man to spread light." (F. W. Robertson) 2. <optics> Of or pertaining to the spectrum; made by the spectrum; as, spectral colours; spectral analysis. Spectral lemur. <zoology> See Tarsius. Source: Websters Dictionary (01 Mar 1998) |
| spectral sensitivity | The reciprocal of the amount of monochromatic radiation that produces a fixed response. (05 Mar 2000) |