alum - arc
- antiphase domains
- antipiping compound
- antipit agent
- antipitting agent
- antiprecipitant
- antireflection coating
- antirust paint
- antirust paper
- antirusting paint
- antiscale
- antispattering agent
- antistick agent
- antisymmetric wave function
- antisymmetrical (energy) level
- antisymmetry operation
- antitarnish paper
- antitype
- antivacuum pipe
- antozonite
- anvil
- anvil block
- anvil cinder
- anvil cinder plate
- anvil cushion
- anvil fuller
- anvil scale
- anvil smith
- anvil swage
- AOD process
- aperture lens
- aperture plate
- apertured
- apex of crack
- aphrizite
- apjohnite
- aplanatic object glass
- apparatus for handling workpieces
- apparatus for turning rounds
- apparent density
- apparent focal area