| circadian |
denoting or concerning behavioral or physiological activities that recur at about twenty-four-hour intervals, such as sleep rhythms. |
| Circadian rhythm |
the approximately 24-hour cycle apparent in plants and animals that regulates hormone production, cell regeneration, sleeping and feeding patterns, and the like. [2 definitions] |
| Circe |
in Greek mythology, an enchantress who turns sailors into swine. |
| circle |
a closed curve along which every point is the same distance from a fixed center point. [8 definitions] |
| circlet |
a little circle, esp. a narrow round band worn as an ornament for the head. |
| circuit |
a usu. circular line or route around an enclosed area. [8 definitions] |
| circuit board |
a backing, panel, or card, often insulated, on which electronic circuits and other components are set or imprinted. |
| circuit breaker |
a switch or other device that automatically interrupts the electric current when a circuit is overloaded or extremely stressed in another way. |
| circuit court |
a court that can hold sessions in different locations in a judicial district. [2 definitions] |
| circuitous |
having or taking a long and winding course or procedure; roundabout; indirect. |
| circuit rider |
a clergyman who travels to preach in different parts of an area or district. |
| circuitry |
the plan or design of the elements in an electric circuit. [2 definitions] |
| circular |
having the shape of a circle; round. [5 definitions] |
| circular file |
(informal) a wastebasket. |
| circularize |
to send circulars to, or to advertise with circulars. [3 definitions] |
| circular saw |
a power saw featuring a disk-shaped blade that is rotated at high speed. [2 definitions] |
| circulate |
to move or flow continuously along a closed path or system. [4 definitions] |
| circulating library |
see "lending library." [2 definitions] |
| circulation |
motion in a circle or along a circuit. [4 definitions] |
| circulatory |
of or pertaining to circulation. [2 definitions] |
| circulatory system |
a system in the body made up of the heart, blood vessels, blood, and lymph vessels that carries blood and lymph around the body. |