- lee de forest
- lit. '(my) father was a monarch'—to harp on one's royal past
- line_ clear (a signal given on railway stations)
- lautaro youth movement
- leave a much to be desired
- lovelace
- louis comfort tiffany
- Lilo
- lichen syphiliticus
- lichenes
- logical element
- logical frame
- ligamentum testis
- ligamentum sternocostalis radiata
- ligamentopexy
- light show
- loyalist volunteer force
- leading off
- liquid contactant
- largemouth black bass
- largemouthed bass
- learned response
- louis d'outremer
- lehar
- leo tolstoy
- leopold stokowski
- laennecs cirrhosis
- lysholm table
- leymus condensatus
- leydig's cell
- lola montez
- lesser duckweed
- long_handled spade
- linum usitatissimum
- like royalty
- lymphoedema
- lymphangioma cavernosum
- lysogeny
- lysogenicity
- logrolling
- lymphocytophthisis
- leucopaenic leukaemia
- lymphoreticular neoplasia
- laminaria cloustoni
- lectin
- LDL
- low_density lipoprotein
- line skew
- lionel barrymore
- lorenzo de'medici
