periodic
circulatory
periscope
circumnavigate
perigee
period
periphery
circumstance
circumvent
circuit
the interval between certain happenings
the condition surrounding an event
and instrument for seeing around things
to sail around
to go around or to bypass
the outer boundary of something
happening at regular intervals
a revolviing; a journey around
the point in the moon's or a satellite's orbit that is closest to the earth or bod it is orbiting
going in a circuit
