Index of English words, starting with "sp"

(1) - Spectral (a.) Of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis.
(2) - Spectral (a.) Of or pertaining to a specter; ghosty.

(1) - Spectrally (adv.) In the form or manner of a specter.

(1) - Spectre (n.) See Specter.
(2) - Spectre (n.) A stick insect.
(3) - Spectre (n.) The tarsius.
(4) - Spectre (n.) Something preternaturally visible; an apparition; a ghost; a phantom.