- knoting compound
- knotted schist
- knotty
- knox process
- knuckle post
- knuckle-buster
- kotschubeite
- kratogen
- kraurite
- Kremser formula
- krn block
- kuramatsu
- kylito
- labeled
- labile form
- labile region
- labyrinth packing
- lac
- laccolithic
- lacquer
- lacquer diluents
- lacquer solvent
- lacquer thinner
- lacrimatory
- lacteous
- lactone
- lacustrine facies
- lacustrine limestone
- laid-up
- laitance
- lake asphalt
- lake basin
- lake oil
- lake ore
- lakelet lake
- Lalande cell
- lamellar pearlite
- lamellar structure
- lamina
- laminar structure
- laminated
- laminated coal
- laminated glass
- laminated section
- laminated wood
- lamp glass
- lamp oil
- lamp wax
- lampblack
- land
- land area
- land asphalt
- land carriage
- land chain
- land form
- land interest
- land jobber
- land league
- land measuring
- land sediment
- land surveying
- Land tax
- landed price
- landing chart
- landing ground
- landtied island
- lanoline
- lansfordite
- lanthanoide
- lanthanum
- lap
- lap joint
- lapidary
- lapidification
- lapin
- lapse
- Laramian revolution
- laser glass
- last
- last runner
- lasting
- latch on
- latching
- late maturity
- latent magnetization
- latent modulus
- latent valence
- later arrival
- lateral displacement
- lateral migration
- lateral permeability
- lateral pressure
- lateritic cement
- latex
- latex foam
- latex ingredient
- latexed
- laticiferous
- latitude correction
- lattice