- Labyrinthitis
- Lac
- Laccase
- Lacerations
- Lachman test
- Lachnospiraceae
- Lacosamide
- Lacquer
- Lacrimal apparatus
- Lacrimal artery
- Lacrimal bone
- Lacrimal canaliculi
- Lacrimal fluid
- Lacrimal fossa
- Lacrimal gland
- Lacrimal groove
- Lacrimal lake
- Lacrimal nerve
- Lacrimal papilla
- Lacrimal punctum
- Lacrimal sac
- Lacrimal system
- Lacrimation
- Lactacystin
- Lactalbumin
- Lactam
- Lactase
- Lactase deficiency
- Lactase persistence
- Lactate dehydrogenase
- Lactated ringers solution
- Lactation
- Lactation consultants
- Lactation failure
- Lactation suppression
- Lactational amenorrhea
- Lacteals
- Lactic acid
- Lactic acid bacteria
- Lactic acid fermentation
- Lactic acidosis
- Lactide
- Lactiferous ducts
- Lactitol
- Lactobacillales
- Lactobacilli
- Lactobacillus
- Lactobacillus acidophilus
- Lactobacillus casei
- Lactobacillus crispatus
- Lactobacillus helveticus
- Lactobacillus iners
- Lactobacillus jensenii
- Lactobacillus johnsonii
- Lactobacillus paracasei
- Lactobacillus plantarum
- Lactobacillus reuteri
- Lactobacillus rhamnosus
- Lactobionic acid
- Lactococcus
- Lactococcus garvieae
- Lactococcus lactis
- Lactoferricin
- Lactoferrin
- Lactol
- Lactones
- Lactoperoxidase
- Lactophenol cotton blue
- Lactose intolerance
- Lactose permease
- Lactose synthase
- Lactosylceramide
- Lactotroph
- Lactuca virosa
- Lactucin
- Lactucopicrin
- Lactulose
- Lacuna
- Lacunae
- Lacunar ligament
- Lacunar stroke
- Ladd's bands
- Ladostigil
- Laetrile
- Lafora disease
- Lag phase
- Lagerstroemia speciosa
- Lagging
- Lagophthalmos
- Lambda cyhalothrin
- Lambert-Eaton myasthenic syndrome
- Lambl's excrescences
- Lamellae
- Lamellar body
- Lamellar bone
- Lamellar ichthyosis
- Lamellar phase
- Lamellar structure
- Lamellipodia
- Lamellipodium
- Lamictal
- Lamin
- Lamin B receptor
- Lamina
- Lamina densa
- Lamina dura
- Lamina lucida
- Lamina papyracea
- Lamina propria
- Lamina terminalis
- Laminar flow cabinets
- Laminar organization
- Laminarin
- Laminectomy
- Laminopathies
- Laminopathy
- Laminoplasty
- Laminotomy
- Lamivudine
- Lamotrigine
- Lampreys
- Lanadelumab
- Lanatoside C
- Lancefield grouping
- Landau-Kleffner Syndrome
- Landau-Kleffner syndrome
- Landfill gas
- Landraces
- Langat virus
- Langendorff heart
- Langer's lines
- Langerhans cell
- Langerhans cell histiocytosis
- Langerhans cell sarcoma
- Langerin
- Language delay
- Language development
- Language disorders
- Language module
- Laninamivir
- Lanolin
- Lanostane
- Lanosterol
- Lanosterol 14 alpha-demethylase
- Lanreotide
- Lansoprazole
- Lanthanum
- Lanthanum carbonate
- Lanthionine
- Lantibiotics