- Luger
- lug foresail
- luggage
- luggage van
- lugger
- lugger topsail
- luggie
- Lughnasadh
- lughole
- lug nut
- Lugo
- Lugones
- Lugosi
- lug-rigged
- lugsail
- lug screw
- lug-soled
- lugubrious
- lugworm
- lug wrench
- Luhansk
- Luhrmann
- Lu Hsün
- Luichow Peninsula
- Luik
- Luing
- Luisetti
- Lukacs
- Lukács
- Lukan
- Lukas
- Luke
- Luke, the Gospel According to
- lukewarm
- lukewarmness
- Luks
- lulab
- LULAC
- lulav
- Luleå
- Luleälv
- lull
- lullaby
- lull into
- Lully
- lulu
- Luluabourg
- lulz
- lum
- luma
- lumb-
- lumbago
- lumbar
- lumbar plexus
- lumbar puncture
- lumber
- lumbering
- lumberjack
- lumberjacket
- lumber jacket
- lumberman
- lumbermill
- Lumber River
- lumber room
- lumbersexual
- Lumberton
- lumberyard
- lumbo-
- lumbosacral
- lumbrical
- lumbricalis
- lumbricoid
- lumen
- lumen-hour
- lum-hat
- Lumholtz's kangaroo
- Lumière
- Luminaire
- Luminal
- 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
- lumpectomy
- lumpen
- lumpenprole
- lumpenproletariat
- lumper
- lumpfish
- lump hammer
- lump in one's throat
- lumpish
- lump of sugar
- lumpsucker
- lump sum
- lumpy
- lumpy jaw
- Lumumba
- Luna
- lunacy
- luna moth
- lunar
- lunar caustic
- lunar cycle
- lunar day
- lunar distance
- lunar eclipse
- lunar excursion module
- lunarian
- lunar module
- lunar month
- Lunar New Year
- Lunar Orbiter
- lunar rainbow
- lunar rover
- lunarscape
- lunar year
- lunate
- lunatic
- lunatic asylum
- lunatic fringe
- lunation
- lunch
- lunchbox
- lunch counter
- luncheon
- luncheon club
- luncheonette
- luncheon meat
- luncheon voucher
- lunchhook
- lunch hour
- lunchmeat
- lunchpail
- lunchroom
- lunchtime
- lunchwagon
- lunchy
- Lund
- Lundberg
- Lundy
- Lundy's Lane
- Lundy Isle
- lune
- Lüneburg
- Lünen
- lunes
- lunette
- Lunéville
- lung
- lungan
- lung book
- lunge
- lungee
- lungeous
- lunger
- lungfish
- lung fluke
- lungi
- Lungki
- lungs
- lungworm
- lungwort
- lungyi
- luni-
- Lunik
- lunisolar
- lunisolar precession
- lunitidal
- lunitidal interval
- lunk
- lunker
- lunkhead
- lunt
- Lunt
- lunula
- lunular
- lunulate
- luny
- Luo
- Luoravetlan
- Luoyang
- lupanar
- Lupe
- Lupercalia
- Lupercus
- lupin
- lupine
- Lupino
- lupoma
- lupulin
- lupus
- Lupus
- lupus erythematosus
- lupus vulgaris
- lur
- Luray
- Lurçat
- lurch
- lurcher
- lurdan
- lure
- Lurex
- lurgy
- Luria
- lurid
- Lurie
- Luristan
- lurk
- lurking
- Lusaka
- Lusatia
- Lusatian
- luscious
- luser
- lush
- lusher
- lushhead
- Lushootseed
- Lüshun
- lushy
- Lusitania
- Lusitanian
- Luso-
- lust
- luster
- lustered
- lusterer
- lustering
- luster painting
- lusterware
- lustful
- lustihood
- lustral
- lustrate
- lustre
- lustreware
- lustring
- lustrous
- lustrum
- lusty
- lusus naturae
- Lü-ta
- lutanist
- Lut Desert
- lute
- luteal
- luteal phase
- lutefisk
- lutein
- luteinize
- luteinizing hormone
- luteinizing hormone-releasing hormone
- lutenist
- luteo-
- luteolin
- luteotrophin
- luteotropic
- luteous
- lute stern
- lutestring
- Lutetia
- lutetium
- Luth.
- Luther
- Luther, Martin
- Lutheran
- Lutheran Church
- luthern
- Lutherville-Timonium
- luthier
- Luthuli
- Lutine bell
- luting
- lutist
- lutite
