- aid
- air box
- air clutch
- air drilling
- air exhaust
- air intel
- air jacket
- air scrubber
- air shooting
- air tool
- alarm fuse
- albarium
- albian stage
- alcogas
- alcohol derivative
- aldol
- alarm
- Alberger process
- alcoholic strength
- alcoholysis
- algin
- aliphatic compound
- aliphatic hydrocarbon
- alkali rock
- alkali treating
- alkali wash
- alkalimetry
- alkaline cell
- alkaline medium
- alkaline metal
- alkaline wash
- Alkar process
- alkoxide
- alkyl pant
- alkylation
- alkylation gasoline
- alkylbenzene
- alkylene
- allied oil
- alligatoring
- allochtonous deposit
- allomorphic
- allotment
- allotriomorphic structure
- air bleed
- air blower
- air buoyancy
- air clip
- air cock
- air condenser
- air cooling
- air seal
- air separator
- air supply
- airplane oil
- albertite
- alcohol carburetor
- alga reef
- algarite
- alginate
- alicyclic
- aliphatic
- aliphatic chemicals
- alkali blue
- alkali cellulose
- alkali strength
- alkali test
- alkalimeter
- alkaline bath
- alkaline battery
- alkaline phosphate
- alkalinous
- alky gas
- alkyl radical
- alkylate bottoms
- alkylate polymer
- alkylation process
- alkylation reaction
- alkylidene
- alkylphenol resin
- all-grass
- alliaceous
- alligation
- alligator grab
- allotropy
- allowable
- allowable production
- alloy pipe
- alloyage
- alluvial cone
- alluvial deposit
- alluvial slope
- alluvial terrace
- almond oil
- alona
- alpaca
- alpax
- alpco wax
- alpha quartz
- alpine relief