acti - air
- actinal
- actinal furrow
- actine
- actinian
- actinic absorption
- actinide element
- actinium
- actinocamax
- actinodont
- actinoform
- actinolite
- actinolitic
- actinometer
- actinomorphic
- actinopod
- actinopterygii
- actinosiphonate
- actinosiphonate deposits
- actinostele
- actinouranium
- actinozoan
- action radius
- activate
- activated adsorption
- activated charcoal
- activated clay
- activated coal hardening
- activated coal regenerating
- activated platform
- activated plough
- activated-coal cyanidation
- activation
- activation action
- activation analysis
- activation energy
- activation logging
- activator
- active cave
- active channel
- active earth pressure
