circ - colu
- circadian rhythm
- circle
- circle theorem
- circling descent
- circuit
- circuit breaker
- circuit element
- circuit speed
- circular airfoil
- circular arc
- circular arc airfoil
- circular arc fairing
- circular cone
- circular configuration
- circular cross-section fuselage
- circular cross-sectional shape
- circular cylinder
- circular delamination
- circular error probability
- circular frequency
- circular intake
- circular jet
- circular nose
- circular plate
- circular polarization
- circular section fuselage
- circular shell
- circular trailing edge
- circular trajectory
- circular wing
- circular-arc centerline
- circular-arc segment
- circular-body missile
- circular-cross-section nose
- circulating oil system
- circulation
- circulation control aerodynamics
- circulation control airfoil
- circulation control wing
- circulation controlled airfoil
