adjective lu·mi·nous \ˈlü-mə-nəs\

: producing or seeming to produce light

: filled with light : brightly lit

: very bright in color

Full Definition of LUMINOUS

a :  emitting or reflecting usually steady, suffused, or glowing light
b :  of or relating to light or to luminous flux
:  bathed in or exposed to steady light <luminous with sunlight>
:  shining, illustrious <a luminous film star> <a luminous performance>
lu·mi·nous·ly adverb
lu·mi·nous·ness noun

Examples of LUMINOUS

  1. I saw the cat's luminous eyes in my car's headlights.
  2. a watch with a luminous dial
  3. The room was luminous with sunlight.

Origin of LUMINOUS

Middle English, from Latin luminosus, from lumin-, lumen
First Known Use: 15th century

Synonym Discussion of LUMINOUS

bright, brilliant, radiant, luminous, lustrous mean shining or glowing with light. bright implies emitting or reflecting a high degree of light. brilliant implies intense often sparkling brightness. radiant stresses the emission or seeming emission of rays of light. luminous implies emission of steady, suffused, glowing light by reflection or in surrounding darkness. lustrous stresses an even, rich light from a surface that reflects brightly without glittering.

Rhymes with LUMINOUS

LUMINOUSNESS Defined for Kids


adjective lu·mi·nous \ˈlü-mə-nəs\

Definition of LUMINOUS for Kids

:  giving off light <The dial of the clock was luminous and it shed a very soft green light. — George Selden, The Cricket in Times Square>
lu·mi·nous·ly adverb
Medical Dictionary


adjective lu·mi·nous \ˈlü-mə-nəs\

Medical Definition of LUMINOUS

:  emitting or reflecting usually steady, suffused, or glowing light
:  of or relating to light or to luminous flux


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