area cover - axial elongation
- arrow
- arrow plot
- arsenic apparatus
- arsenic compound
- arsenical
- arsenide
- arseno-compound
- arsenous
- arsenous compound
- arteriarctia
- arterit
- artesian
- artesian aquifer
- artesian basin
- artesian capacity of a well
- artesian discharge
- artesian flow
- artesian flow regime
- artesian head
- artesian pressure
- artesian spring
- artesian water
- artesian water flow
- artesian well
- artesian-pressure head
- artesian-pressure surface
- Arthur D. Little
- article
- articulate
- articulated
- articulated arm joint
- articulated column
- articulated coupling
- Articulated Density Log
- articulated flare
- articulated joint
- articulated loading platform
- articulated offshore platform
- articulated platform
- articulated telescopic shaft
