a.
He that feels timid at the spectral form of evil is not the man to spread light. F. W. Robertson. [ 1913 Webster ]
Spectral lemur. (Zool.)
adv. In the form or manner of a specter. [ 1913 Webster ]
The ghosts of traitors from the bridge descend,
With bold fanatic specters to rejoice. Dryden. [ 1913 Webster ]
Specter bat (Zool.),
Specter candle (Zool.),
Specter shrimp (Zool.),
n. See Specter. [ 1913 Webster ]
n. (Physics) A combination of spectroscope and bolometer for determining the distribution of energy in a spectrum. --
a. Pert. to or designating any form of spark tube the electric discharge within which is used in spectroscopic observations. [ Webster 1913 Suppl. ]
n. [ Spectrum + -gram. ] (Physics) A photograph, map, or diagram of a spectrum. [ Webster 1913 Suppl. ]
n. [ Spectrum + graph. ] (Physics)
n. [ Spectrum + heloi- + -gram. ] (Astrophysics) A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's faculae and prominences. [ Webster 1913 Suppl. ]
n. (Astrophysics) An apparatus for making spectroheliograms, consisting of a spectroscopic camera used in combination with a telescope, and provided with clockwork for moving the sun's image across the slit. --