- alternate operation
- altitude control
- aludum
- alum hardening
- alum mine
- alum shale
- alumina
- alumina cement
- aluminates
- aluming
- aluminiferrous
- aluminium bronze
- aluminium fluorite
- aluminium hydroxide
- aluminium soap
- aluminized coating
- aluminothermics
- aluminothermy
- aluminous
- aluminum
- aluminum carbide
- aluminum chloride
- aluminum naphtenate
- aluminum oleate
- aluminum ore
- aluminum oxide
- aluminum palminate
- aluminum powder
- aluminum silicate
- aluminum steel
- aluminum welding
- alumstone
- alunitized
- amalgam press
- amalgamate
- amalgamated metal
- amalgamated mine
- amalgamating
- amalgamation
- amalgamator
- amalgamized
- ambergris
- ameylene
- amianthus
- amino
- aminoplastic
- ammonal
- ammonia alum
- ammonia contamination
- ammonia header
- ammonia liquor
- ammonia oil
- amylic alcohol
- analytical chemistry
- anchor shoe
- ancient cliff
- andiroba
- angelique
- angular unconformity
- angularity
- anhydritic clay
- aniline ink
- animal wax
- anionic detergent
- anisotropic materials
- annulus
- anodic solution
- anodizing
- anthracene oil
- angle value
- angular correction
- anhydride
- aniline dye
- aniline oil
- aniline salt
- animal fat
- animal oil
- Anisian stage
- anisotropic crystal
- anisotropic membrane
- annealing heat
- annealing process
- annular space
- anode mud
- anode potential
- anodic etching
- anodic polarization
- anorthoclase
- ammonia spirit
- ammonia synthesis
- ammonia-operated
- ammoniac
- ammoniacal water
- ammonium
- ammonium hydroxide
- ammonium nitrate
- ammonium sulfate
- amorphous material
- amorphous wax
- amphoteric detergent