- acetylene cutter
- acetylene flame
- acetylene generation
- acetylene hose
- acetylene regulator
- acetylene valve
- achieve
- achromatic
- achromatic color
- achromatic lens
- achromatic lenses
- achromatization
- aci-from
- acid Acid
- acid bath
- acid converter
- acid cure
- acid dip
- acid embossing
- acid etching
- acid hardening
- acid lining
- acid polishing
- acid reaction
- acid recovery
- acid rock
- acid soil
- acid soot
- acid tester
- acid-fast
- acid-proof
- acidicity
- acidimeter
- acidity
- acidless
- acidometer
- acidulation
- acidulous
- acierage
- acieration
- aciform
- acknowledge pulse
- acknowledge request
- acknowledgement
- aconuresis
- acorn tube
- acoumeter
- acoustic absorber
- acoustic absorption
- acoustic admittance