- leonard bernstein
- leon trotsky
- leo delibes
- leo i
- like mad
- like kings
- like thunder
- lenitive
- lepidoptery
- language translation feature
- lit. self_choice—an ancient custom wherein a bride chose her husband of her own accord
- loop update
- leucoplakia
- loevi test
- length of middle finger
- lepromatous nodule
- long_prevalent
- long_current
- low resistance path
- lit. fools do not grow horns over their heads
- low sodium syndrome
- low output failure
- lochiometritis
- logical structure
- logical line group
- logical group instruction
- loop counter
- loop completion
- loop testing
- loop input signal
- loop transmission
- lung abscess
- lactam linkage
- lit. ocean of kindness—an epithet of god
- liebfraumilch
- leave to the mercy
- leave to the mercies
- laminated coating
- louis leakey
- louis seymour bazett leakey
- learn the rope
- leveller
- lymphadenosis
- leucoplakia valvae
- leptospiral meningitis
- leptosome pachysome factor
- leukoencephalopathy
- lymphangiophlebitis
- lit. to distribute cardamoms—to invite to a marriage ceremony and feast (as per muslim tradition)
- lower_motor neurone lesion