- liquid inlet
- liquid luminescence
- liquid methane
- liquid motion
- liquid return
- liquid stage
- liquid subcooler
- liquidity
- lithography
- load characteristic
- load discriminator
- load resistor
- load test
- load variation
- loading pattern
- local exchange
- local freezing
- load impedance
- load leveling
- load pulldown
- load requirements
- load section
- loaded fluctuation
- loaded Q
- loading end
- local network
- locker
- locker plant
- Loeb" criterion
- logarithmic increment
- logic control
- locus diagram
- loop
- loop flow
- loop winding
- loopback test
- loose freezing
- loose ice
- loose packed
- local thermostat
- logarithmic potential
- long discharge
- long spark
- long-range
- longitude effect
- longitudinal current
- longitudinal elasticity
- longitudinal magnification
- longitudinal quadrupole
- Lorentz cycle
- Lorentz electron
- Lorentz gage
- Lorentz number
- Lorentz-contraction
- Lorentz-covariant
- Lorenz cycle
- loss
- loss evaluation
- low stage
- low-noise
- low-reflection
- low-sensibility
- low-volatility
- lowest level
- lubricated compressor
- long-lived
- longitudinal aberration
- longitudinal fin
- longitudinal magnetization
- longitudinal magnetoresistance
- loss angle
- loss cone
- loss factor
- loss meter
- loss ratio
- loss tangent
- lossy line
- loudspeaker baffle
- louvered compartment
- low
- low frequency
- lost heat
- low angle
- low level
- low sensitivity
- low-conductivity
- low-loss
- low-molecular
- lower atmosphere
- lower dimensionality
- luminescence efficiency
- luminiferous
- luminiferous ether
- luminosity class
- luminous efficacy
- luminous flux
- lump ice
- lumped constant
- lumped discontinuity
- lumped element