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Medical Word Parts - Letter: l
| Term | Definition |
| labi/o | lips, labia |
| -labile | unstable, subject to change |
| labyrinth/o | inner ear |
| lacrim/o | tears |
| lact/o | milk |
| lacti- | milk |
| lal/o | speech |
| lamin/o | lamina (part of the vertebral arch that forms the roof of the spinal canal) |
| lampr/o | clear |
| lapar/o | abdominal wall |
| laryng/o | larynx |
| later/o | side |
| lecith/o | yolk, ovum |
| -legia | reading |
| lei/o | smooth |
| leiomy/o | smooth (visceral) muscle |
| -lemma | sheath, confining membrane |
| lepid/o | flakes, scales |
| -lepsis | seizure |
| -lepsy | seizure |
| lept- | thin, slight, slender |
| leuk/o | white |
| leukocyt/o | white blood cell |
| levo- | left |
| -lexia | reading, word |
| lien/o | spleen |
| lingu/o | tongue |
| lip/o | fat, lipid |
| -lipsis | omit, fail |
| -listhesis | slipping |
| lith/o | stone, calcification |
| -lithiasis | presence of stones |
| -lithotomy | incision for stone removal |
| lob/o | lobe |
| loc- | place |
| -log | speech, words, thought |
| log- | speech, words |
| logad/o | whites of the eyes |
| -logist | specialist |
| logo- | words, speech |
| -logy | study of |
| loph/o | ridge, crested part |
| lord/o | curve, swayback |
| lox/o | oblique, slanting |
| luc/i | light |
| -lucent | light admitting |
| lumb/o | lower back |
| lumin/o | lumen (channel within a tube) |
| lymph/o | lymph |
| lymphaden/o | lymph node |
| lymphangi/o | lymph vessel |
| -lysis | loosening, separating |
| lyso- | dissolution, loosen |