- lepisosteus
- lepisosteus osseus
- lepista irina
- lepomis
- lepomis gibbosus
- lepomis macrochirus
- lepomis punctatus
- leporid
- leporid mammal
- leporidae
- leporide
- leppy
- leprechaun
- lepromatous leprosy
- leprose
- leprosy
- leprosy bacillus
- leprous
- leptarrhena
- leptarrhena pyrolifolia
- leptinotarsa
- leptinotarsa decemlineata
- leptocephalus
- leptodactylid
- leptodactylid frog
- leptodactylidae
- leptodactylus
- leptodactylus pentadactylus
- leptoglossus
- leptomeninges
- leptomeningitis
- lepton
- leptopteris
- leptopteris superba
- leptoptilus
- leptoptilus crumeniferus
- leptoptilus dubius
- leptorhine
- leptorrhine
- leptorrhinian
- leptorrhinic
- leptospira
- leptospirosis
- leptosporangiate
- leptosporangium
- leptotene
- leptotyphlopidae
- leptotyphlops
- leptotyphlops humilis
- lepus
- lepus americanus
- lepus arcticus
- lepus californicus
- lepus europaeus
- lepus townsendi
- ler
- leresis
- lermontov
- lerner
- leroi jones
- lerot
- leroy robert paige
- lesbian
- lesbianism
- lesbos
- lescol
- lese majesty
- lesion
- leslie howard
- leslie howard stainer
- leslie richard groves
- leslie townes hope
- lesotho
- lesotho monetary unit
- lespedeza
- lespedeza bicolor
- lespedeza cuneata
- lespedeza sericea
- lespedeza stipulacea
- lespedeza striata
- lesquerella
- less
- lessee
- lessen
- lessened
- lessening
- lesseps
- lesser
- lesser anteater
- lesser antilles
- lesser ape
- lesser bullrush
- lesser burdock
- lesser butterfly orchid
- lesser calamint
- lesser celandine
- lesser centaury
- lesser duckweed
- lesser galangal
- lesser hemlock
- lesser knapweed
- lesser kudu
- lesser omentum
- lesser panda
- lesser peritoneal cavity
- lesser prairie chicken
- lesser rhomboid muscle
- lesser rorqual
- lesser scaup
- lesser scaup duck
- lesser spearwort
- lesser sunda islands
- lesser twayblade
- lesser whitethroat
- lesser wintergreen
- lesser yellow trefoil
- lesser yellowlegs
- lessing
- lesson
- lessor
- less-traveled
- lester willis young
- lesvos
- let
- let alone
- let down
- let drive
- let fly
- let go
- let go of
- let in
- let it go
- let loose
- let off
- let on
- let out
- let the cat out of the bag
- let up
- letch
- letdown
- lethal
- lethal agent
- lethal dose
- lethal gene
- lethality
- lethargic
- lethargic encephalitis
- lethargically
- lethargy
- lethe
- leto
- letter
- letter bomb
- letter bond
- letter box
- letter carrier
- letter case
- letter of credit
- letter of intent
- letter of jeremiah
- letter of mark and reprisal
- letter of marque
- letter of the alphabet
- letter opener
- letter paper
- letter security
- letter stock
- letter telegram
- letter writer
- lettercard
- lettered
- letterer
- letterhead
- lettering
- letterman
- letter-perfect
- letterpress
- letters
- letters of administration
- letters of marque
- letters patent
- letters testamentary
- letterset printing
- letting
- letting down
- lettish
- lettre de cachet
- lettuce
- letup
- leu
- leucadendron
- leucadendron argenteum
- leucaemia
- leucaena
- leucaena glauca
- leucaena leucocephala
- leucanthemum
- leucanthemum lacustre
- leucanthemum maximum
- leucanthemum superbum