Circ- Circum- means round, around
circle (n) - a round shape that has no beginning or end
circlet (n) - a small circle; a ring or round band worn as an ornament, especially on the head
circuit (n) - a path for an electrical current to flow around
circulate (v) - to move around an area or a place, often returning to a starting point
circumference (n) - the distance all the way around a circle
circumflex (adj) - bending around; curved
circumnavigate (v) - to go completely around
circumrotate (v) - to turn around like a wheel
circumspect (adj) - careful; careful to look all around before doing something
circumvent (v) - to prevent something from happening by careful thinking; to get around something; to entrap