Definition

1. Adjective:
   • Emitting or reflecting light; shining brightly: Describes something that produces its own light or reflects light in a way that makes it bright and visible, often with a soft or steady quality.
   • Clear and enlightening: Used figuratively to describe something, like an idea or explanation, that is intellectually clear and illuminating.

Examples of Usage

• Adjective:
  • The watch has a luminous dial, so you can tell the time in the dark.
  • The room was filled with a soft, luminous glow from the fireplace.
  • Her writing provides a luminous insight into the human condition.

Advanced Usage

• "Luminous intensity": A scientific term in physics referring to the power of a light source as perceived by the human eye, measured in candelas.

  • The luminous intensity of the LED bulb is very high for its low energy consumption.

• "Luminous efficacy": A measure of how well a light source produces visible light, expressed in lumens per watt.

  • Modern lighting seeks to improve luminous efficacy to save energy.

Variants and Related Words

• Luminance (n): The intensity of light emitted from a surface per unit area in a given direction.

  • The screen's high luminance makes it easy to read in sunlight.

• Luminescence (n): The emission of light by a substance not resulting from heat (e.g., phosphorescence, fluorescence).

  • The luminescence of the jellyfish was a beautiful sight in the dark ocean.

• Illuminate (v): To light up or make clear.

  • The streetlights illuminate the path at night.

Synonyms

• Radiant: Sending out light; shining brightly.
• Glowing: Emitting a steady, warm light.
• Bright: Giving out or reflecting a lot of light.
• Lucent: Glowing with or giving off light (a more literary synonym).

Antonyms

• Dark: With little or no light.
• Dim: Not shining brightly or clearly.
• Dull: Lacking brightness or shine.

Related Phrases and Idioms

• Luminous being: A poetic or spiritual term describing a person or entity perceived as radiant with light, life, or goodness.

  • The poet described the child's spirit as a luminous being.

• Luminous with (an emotion): Figuratively described as glowing or radiant due to a strong positive feeling.

  • Her face was luminous with joy when she heard the news.

Adjective

1. softly bright or radiant
   • a house aglow with lights
   • glowing embers
   • lambent tongues of flame
   • the lucent moon
   • a sky luminous with stars