English Words Starting With L

• luminary

  adjectivenounC1
  /ˈluːmɪnəri/A person who inspires or influences others, especially a prominent person in a particular sphere.
• lumine

  verb-transitiveVery Rare / Archaic
  /ˈluːmɪn/To illuminate, to light up.
• luminesce

  verbverb-intransitiveC2
  /ˌluː.mɪˈnes/To emit light without significant heat; to glow, especially through a physical or chemical process.
• luminescence

  nounC1
  /ˌluːmɪˈnesns/the emission of light by a substance that has not been heated, as a result of some chemical or physical process.
• luminism

  nounC2 (Very Low Frequency)
  /ˈluːmɪnɪz(ə)m/A style or movement in painting, particularly 19th-century American landscape painting, characterized by the meticulous depiction of light and its effects, especially on water and sky.
• luminophore

  nounVery Low
  /ˈluːmɪnə(ʊ)fɔː/A chemical substance that emits light when excited by energy.
• luminosity

  nounLow-frequency, C1/C2
  /ˌluː.mɪˈnɒs.ə.ti/The intrinsic or measurable brightness of a light source; the quality of emitting or reflecting a significant amount of light.
• luminosity class

  nounSpecialized
  /ˌluː.mɪˈnɒs.ə.ti ˌklɑːs/In astronomy, a category describing the intrinsic brightness of a star, determined by its spectrum and independent of its distance from Earth.
• luminous efficacy

  nounVery Low
  /ˌluːmɪnəs ˈɛfɪkəsi/The ratio of the total luminous flux (visible light output) emitted by a light source to the total electrical power consumed by that source.
• luminous efficiency

  nounC2
  /ˌluːmɪnəs ɪˈfɪʃnsi/The ratio of the luminous flux emitted by a light source to the electrical power it consumes, measuring how well the source converts power into visible light.
• luminous emittance

  nounVery Low
  /ˌluː.mɪ.nəs ɪˈmɪt.əns/The luminous flux emitted per unit area of a light source.
• luminous energy

  nounC1/C2 / Very Low Frequency
  /ˈluː.mɪ.nəs ˈen.ə.dʒi/The amount of visible light emitted, transmitted, or reflected by a source, measured in lumens or lumen-seconds (lumen·s). It describes the total visible energy perceived by the human eye.
• luminous exitance

  nounVery Low
  /ˈluːmɪnəs ɪkˈsɪtəns/The total luminous flux emitted per unit area of a surface.
• luminous flux

  nounC1
  /ˌluː.mɪ.nəs ˈflʌks/The total quantity of visible light energy emitted by a light source per unit of time, measured in lumens.
• luminous flux density

  nounC2
  /ˌluː.mɪ.nəs ˈflʌks ˌden.sə.ti/A technical term in photometry and physics for the amount of visible light energy passing through, emitted from, or incident upon a surface area per unit time, essentially describing the 'concentration' of luminous flux (visible light power).
• luminous intensity

  nounC2
  /ˈluːmɪnəs ɪnˈtɛnsəti/A photometric measure of the power of a light source to produce visible light in a given direction, per unit solid angle.
• luminous paint

  nounC1
  /ˌluː.mɪ.nəs ˈpeɪnt/A paint that emits light after being exposed to an energy source, typically glowing in the dark.
• luminous range

  nounLow
  /ˈluː.mɪ.nəs reɪndʒ/The maximum distance at which a given light source can be seen under specific atmospheric conditions.
• lumisterol

  nounExtremely Rare (Technical/Scientific)
  /ˌluːmɪˈstɛrɒl/A steroid compound that is a photosomer of ergosterol, produced by the ultraviolet irradiation of ergosterol.
• lummix

  nounNone / Not found
  This word does not exist in standard English lexicography or established dialects. No authoritative dictionary (OED, Merriam-Webster, Collins, etc.) records it. Its use appears to be either a very recent, highly informal coinage or a proper noun (e.g., a brand, character, or place name).

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