- latent syphilis
- like a knife through butter
- lepus townsendi
- lo
- lit. to open the window—to let in fresh air (of ideas etc.)
- lenticular
- lit. to hide the stomach from the midwife—to keep a secret from one who is bound to know it
- leader record
- leptospirosis icterohamorrhagica
- long_reputed
- lovers' knot
- lipoma petrificans
- locator variable
- lit. shedding of fire
- locator device
- locator qualification
- linear co_efficient
- longitudinal_mode delay line
- linear b
- linear selection
- lumi_rhodopsin
- lambkin
- lytton strachey
- like a duck to water
- look daggers at
- lit. a crown studded with thorns —an authority difficult to wield
- li po
- line data set
- long loop strangulation
- levigating agent
- lent
- lit. emergence of grass on stony
- level of consciousness
- leukaemic erythrodermia
- leukorrhea
- leukeran
- leucoplakic vulvitis
- leucovorum
- leukaemic reticuloendotheliosis
- leonide fedorovitch massine
- lion_faced
- lotus leaf
- lipoma arborescens
- laryngeal sac
- logical add
- look ahead carry
- loch linnhe
- labiolingual diameter
- Livonian
- lose no sleep over