area cover - axial elongation
- arid climate
- arid region
- arid soil
- arithmetic average roughness height
- arithmetic logic unit
- arithmetic mean bed thickness
- arithmetic mean weighted with respect to the reservoir volume
- arithmetical mean bed thickness
- arizonite
- ark
- arkose
- arkose (arkosic sandstone)
- arkosic
- arkosic sandstone
- ARL
- Arlin
- arm
- arm bearing
- arm mixer
- arm of mixer
- arm stirrer
- arm's length trading
- arm's length transactions
- armature
- armature coil
- armed
- armed to the hilt
- arming
- armor
- armor cable
- armor protection
- armor rock
- armor(ed) cable
- armor(ed) cable
- armor(ed) cable
- armor(ed) cable
- armored
- armored bottom-hole thermometer
- armored bottomhole thermometer
- armored cable
