- actual working
- acylate
- adapter flange
- adaptive process
- addendum circle
- addition polymerization
- additive stabilizer
- adduct
- adenine
- adepnine oil
- adherend
- adherometer
- adhesion prompter
- adhesion test
- adiabatic index
- adjacent rock
- adjustable prop
- adjusting rack
- adjustment orifice
- adamantine
- addition polymer
- additive oil
- Adenosine
- adhesion agent
- adhesion promoter
- adhesive
- adhesive strength
- adhesiveness
- adiabatic contraction
- adiabatic cycle
- adipic ester
- adipocere
- adjacent field
- adjustable choke
- adjustable index
- adjusting cone
- adjutant
- admiralty viscosity
- admission velocity
- adsorbable
- adsorbent clay
- adsorbent layer
- adsorbent oil
- adsorbing agent
- adsorption band
- adsorption gasoline
- adsorption method
- adulterant
- adulterated
- adulteration
- advance
- advanced chemistry
- advection
- adventive cone
- adventive crater
- adze
- aeolian basin
- aeolian rock
- aerate
- aerated mud
- aerial arch
- aerial survey
- aeriform
- aeriform catalyst
- aerobic process
- aerometry
- aeronautical chart
- aerozine
- afflux
- affluxion
- after cooling
- after glow
- after runner
- after shock
- agar
- agate
- agate glass
- agba
- agent
- agglomerate
- aggregate
- Aggregate income
- agitating tank
- Aggregate output
- aging test
- agitating vessel
- agrochemistry
- ahead runner
- aikaline phosphatase
- air blast
- air conditional
- air drier
- air drive
- air flooding
- air gas
- air intake
- air receiver
- air wave
- air-cure
- agricultural lime