Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of luminous is as below...

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

Thaumatrope :: Thaumatrope (n.) An optical instrument or toy for showing the presistence of an impression upon the eyes after the luminous object is withdrawn.

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

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..

Clay :: Clay (n.) A soft earth, which is plastic, or may be molded with the hands, consisting of hydrous silicate of aluminium. It is the result of the wearing down and decomposition, in part, of rocks containing aluminous minerals, as granite. Lime, magnesia, oxide of iron, and other ingredients, are often present as impurities..

Sun :: Sun (n.) The luminous orb, the light of which constitutes day, and its absence night; the central body round which the earth and planets revolve, by which they are held in their orbits, and from which they receive light and heat. Its mean distance from the earth is about 92,500,000 miles, and its diameter about 860,000..

Meteor :: Meteor (n.) Specif.: A transient luminous body or appearance seen in the atmosphere, or in a more elevated region..

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..

Voluminous :: Voluminous (a.) Of or pertaining to volume or volumes.

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

Phonoscope :: Phonoscope (n.) An instrument for producing luminous figures by the vibrations of sounding bodies.

Fire Beetle :: Fire beetle () A very brilliantly luminous beetle (Pyrophorus noctilucus), one of the elaters, found in Central and South America; -- called also cucujo. The name is also applied to other species. See Firefly..

Incandescent :: Incandescent (a.) White, glowing, or luminous, with intense heat; as, incandescent carbon or platinum; hence, clear; shining; brilliant..

Dim :: Dim (superl.) Not bright or distinct; wanting luminousness or clearness; obscure in luster or sound; dusky; darkish; obscure; indistinct; overcast; tarnished.

Illustrate :: Illustrate (v. t.) To make clear, bright, or luminous..

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

Voluminous :: Voluminous (a.) Consisting of many folds, coils, or convolutions..

Halo :: Halo (n.) A luminous circle, usually prismatically colored, round the sun or moon, and supposed to be caused by the refraction of light through crystals of ice in the atmosphere. Connected with halos there are often white bands, crosses, or arches, resulting from the same atmospheric conditions..

Dusky :: Dusky (a.) Partially dark or obscure; not luminous; dusk; as, a dusky valley..

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..

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