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Geissler Tube :: Geissler tube () A glass tube provided with platinum electrodes, and containing some gas under very low tension, which becomes luminous when an electrical discharge is passed through it; -- so called from the name of a noted maker in germany. It is called also Plucker tube, from the German physicist who devised it..

Triluminous :: Triluminous (a.) Having three light.

Eclipse :: Eclipse (n.) An interception or obscuration of the light of the sun, moon, or other luminous body, by the intervention of some other body, either between it and the eye, or between the luminous body and that illuminated by it. A lunar eclipse is caused by the moon passing through the earth's shadow; a solar eclipse, by the moon coming between the sun and the observer. A satellite is eclipsed by entering the shadow of its primary. The obscuration of a planet or star by the moon or a planet, thoug

Corona :: Corona (n.) A peculiar phase of the aurora borealis, formed by the concentration or convergence of luminous beams around the point in the heavens indicated by the direction of the dipping needle..

Phosphene :: Phosphene (n.) A luminous impression produced through excitation of the retina by some cause other than the impingement upon it of rays of light, as by pressure upon the eyeball when the lids are closed. Cf. After-image..

Effulgent :: Effulgent (a.) Diffusing a flood of light; shining; luminous; beaming; bright; splendid.

Nebula :: Nebula (n.) A faint, cloudlike, self-luminous mass of matter situated beyond the solar system among the stars. True nebulae are gaseous; but very distant star clusters often appear like them in the telescope..

Self-luminous :: Self-luminous (a.) Possessing in itself the property of emitting light.

Corona :: Corona (n.) A peculiar luminous appearance, or aureola, which surrounds the sun, and which is seen only when the sun is totally eclipsed by the moon..

Sundown :: Sundog (n.) A luminous spot occasionally seen a few degrees from the sun, supposed to be formed by the intersection of two or more halos, or in a manner similar to that of halos..

Dextrorotatory :: Dextrorotatory (a.) Turning, or causing to turn, toward the right hand; esp., turning the plane of polarization of luminous rays toward the right hand; as, dextrorotatory crystals, sugars, etc. Cf. Levorotatory..

Luminous :: Luminous (a.) Enlightened; intelligent; also, clear; intelligible; as, a luminous mind..

Photographometer :: Photographometer (n.) An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays.

Firefly :: Firefly (n.) Any luminous winged insect, esp. luminous beetles of the family Lampyridae..

Light :: Light (n.) That agent, force, or action in nature by the operation of which upon the organs of sight, objects are rendered visible or luminous..

Luminous :: Luminous (a.) Shining; emitting or reflecting light; brilliant; bright; as, the is a luminous body; a luminous color..

Luminosity :: Luminosity (n.) The quality or state of being luminous; luminousness.

Fireball :: Fireball (n.) A luminous meteor, resembling a ball of fire passing rapidly through the air, and sometimes exploding..

Voluminous :: Voluminous (a.) Having written much, or produced many volumes; copious; diffuse; as, a voluminous writer..

Pargasite :: Pargasite (n.) A dark green aluminous variety of amphibole, or hornblende..

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