- lower arm length
- leaders
- lower carboniferous period
- lighted
- leaf fat
- lit. the paunch to be deflated—to lose corpulence
- learning disability
- learning disorder
- line of inquiry
- line of least resistance
- live circuit
- ledger line
- letter perfect
- letter paper
- lateral
- lateral aberrant thyroid tumour
- lateral thinking
- lateral epicondylitis
- lateral humeral epicondylitis
- lift pump
- lit. to beat blue
- last mile
- load test
- littered
- lubitsch
- lubberly
- leslie howard
- lugols solution
- lugols iodine
- lobulus tuberis
- liposomal delivery vector
- lockout module
- linked subroutine
- law of compound interest
- law of substitution
- law of segregation
- laryngomalacia
- laryngotomy
- laundrette
- lustrous
- lustring
- lacrimal abscess
- lab to land
- lab lemco
- lesser toe
- lesser cornua
- lesser curve
- leading graphics
- level ground
- like blue murder