- lowrider
- lowriding
- lowry
- lowse
- lowside window
- lowveld
- lox
- loxodont
- loxodrome
- loxodromic
- loxodromics
- loy
- loya jirga
- loyal
- loyalist
- loyalty
- loyalty card
- lozenge
- lozengy
- loˈgistic
- lpm
- lr
- ls
- lt
- lt-yr
- lt.
- ltr.
- lu
- luach
- luau
- lub
- lub.
- lubber
- lubber grasshopper
- lubber line
- lubber's hole
- lubber's knot
- lubber's line
- lubberly
- lube
- lubra
- lubric
- lubricant
- lubricate
- lubrication
- lubricator
- lubricious
- lubricity
- lubricous
- lubritorium
- lucarne
- luce
- lucency
- lucent
- lucerne
- luces
- lucha libre
- lucid
- lucid dream
- lucida
- lucidity
- lucifer
- lucifer match
- luciferase
- luciferin
- luciferous
- lucifugous
- luck
- luck into
- luck of the devil
- luck of the draw
- luck out
- luckie
- luckily
- luckless
- luckpenny
- lucky
- lucky dip
- lucrative
- lucre
- lucubrate
- lucubration
- luculent
- lud
- lude
- luderick
- ludic
- ludicrous
- ludo
- lues
- luetic
- luff
- luff on luff
- luff tackle
- luffa
- lug
- lug foresail
- lug nut
- lug screw
- lug wrench
- lug-rigged
- lug-soled
- luge
- luggage
- luggage van
- lugger
- lugger topsail
- luggie
- lughole
- lugsail
- lugubrious
- lugworm
- lukewarm
- lulab
- lulav
- lull
- lull into
- lullaby
- lulu
- lulz
- lum
- lum-hat
- luma
- lumb-
- lumbago
- lumbar
- lumbar plexus
- lumbar puncture
- lumber
- lumber jacket
- lumber room
- lumbering
- lumberjack
- lumberjacket
- lumberman
- lumbermill
- lumbersexual
- lumberyard
- lumbo-
- lumbosacral
- lumbrical
- lumbricalis
- lumbricoid
- lumen
- lumen-hour
- luminance
- luminaria
- luminary
- lumine
- luminesce
- luminescence
- luminescent
- luminiferous
- luminism
- luminophore
- luminosity
- luminosity class
- luminous
- luminous efficacy
- luminous efficiency
- luminous emittance
- luminous energy
- luminous exitance
- luminous flux
- luminous flux density
- luminous intensity
- luminous paint
- luminous range
- lumisterol
- lumme
- lummix
- lummox
- lump
- lump hammer
- lump in one's throat
- lump of sugar
- lump sum
- lumpectomy
- lumpen
- lumpenprole
- lumpenproletariat
- lumper
- lumpfish
- lumpish
- lumpsucker
- lumpy
- lumpy jaw
- luna moth
- lunacy
- lunar
- lunar caustic
- lunar cycle
- lunar day
- lunar distance
- lunar eclipse
- lunar excursion module
- lunar module
- lunar month
- lunar rainbow
- lunar rover
- lunar year
- lunarian
- lunarscape
- lunate
- lunatic
- lunatic asylum
- lunatic fringe
- lunation
- lunch
- lunch counter
- lunch hour
- lunchbox
- luncheon
- luncheon club
- luncheon meat
- luncheon voucher
- luncheonette
- lunchhook
- lunchmeat
- lunchpail
- lunchroom
- lunchtime
- lunchwagon
- lunchy
- lune
- lunes
- lunette
- lung
- lung book
- lung fluke
- lungan
- lunge
- lungee
- lungeous
- lunger
- lungfish
- lungi
- lungs
- lungworm
- lungwort
- lungyi
- luni-
- lunisolar
- lunisolar precession
- lunitidal
- lunitidal interval
- lunk
- lunker
- lunkhead
- lunt
- lunula
- lunular
- lunulate
- luny
- lupanar
- lupin
- lupine
- lupoma
- lupulin
- lupus
- lupus erythematosus
- lupus vulgaris
- lur
- lurch
- lurcher
- lurdan
- lure
- lurgy
- lurid
- lurk
- lurking
- luscious
- luser
- lush
- lusher
- lushhead
- lushy
- lust
- luster
- luster painting
- lustered
- lusterer
- lustering
- lusterware
- lustful
- lustihood
- lustral
- lustrate
- lustre
- lustreware
- lustring
- lustrous
- lustrum
- lusty
- lusus naturae
- lutanist
- lute
- lute stern
- luteal
- luteal phase