3D optical disc storage

3-position 4-way disc valve

A rotating and a stationary disc

abdominal vertebra disc

Abrasion of disc cutters

abrasive disc

absorber disc

accretion disc

acetate disc

actuating disc

actuator disc

acute disc prolapse

adhesive disc

adhesiver disc

adjacent segment disc degeneration

adjusting disc

adjustment disc

air plane wheel brake disc

Aircraft brake disc

airplane brake disc