- laborious
- labryrinth
- labyrinth
- lac dye
- laceration
- lachrymal gland
- lachrymatory
- lacrimal gland
- lacrimation
- lade
- laissez faire
- lactase
- lactation
- lactic acid
- lactose
- lallygag
- laggard
- lagging
- lyre
- lyricism
- louse
- lout
- lump
- lap
- letter
- lick
- locomotor ataxia
- leave of absence
- leave
- lease
- leader
- lot
- leisure
- loopy
- loony
- longing
- lofty
- loud
- legacy
- lend
- loan
- liquidation
- like
- lip
- live
- lattice
- lid
- lassitude
- light
- lotus