lowe - mari
- lower arc
- lower atmosphere
- lower circumzenithal arc
- lower cloud
- lower mirage
- lower stratosphere
- lower symmetric regime
- lower troposphere
- Lowitz arcs
- loxodrome
- LRIR
- LRSS
- LST
- lu
- lucimeter
- luganot
- lull
- lumen
- luminance
- luminance contrast
- luminance temperature
- luminescence
- luminosity
- luminous
- luminous cloud
- luminous density
- luminous efficiency
- luminous emittance
- luminous energy
- luminous exposure
- luminous flux
- luminous flux density
- luminous intensity
- luminous meteor
- luminous night cloud
- luminous vapor trail
- lunar atmospheric tide
- lunar barometric variation
- lunar calendar
- lunar corona
