| control experiment |
an experiment in which variables are controlled in order to make clear the effects of varying factors one at a time. |
| controlled substance |
any drug whose sale or use is subject to U.S. federal law. |
| controller |
one who regulates or controls. [2 definitions] |
| control rod |
a rod or bar in a nuclear reactor that contains a neutron-absorbing material, and that is lowered into or raised from the core to control the fission chain reaction. |
| control tower |
a tower at an airport from which air traffic is directed by radio. |
| controversial |
of, relating to, or characterized by controversy. [3 definitions] |
| controversy |
a dispute, esp. a public one, marked by the expression of opposing views; debate. [2 definitions] |
| controvert |
to argue in opposition to. |
| contumacious |
stubbornly disobedient; insubordinate; rebellious. |
| contumacy |
stubborn and obstinate resistance to authority; rebelliousness. |
| contumely |
contemptuous insolence; rudeness. [2 definitions] |
| contuse |
to injure without lacerating the skin; bruise. |
| contusion |
an injury that does not involve laceration of the skin; bruise. |
| conundrum |
a puzzle or problem with a difficult or impossible solution. [2 definitions] |
| conurbation |
a large urban area composed of cities and suburbs that have grown and merged together. |
| convalesce |
to regain health or strength after an illness or injury. |
| convalescence |
the gradual process of recuperation from an illness, or the period during which it takes place. |
| convection |
the motion or transmittal of heat through a liquid or gas because of the natural rising of the heated parts and sinking of the cooled parts. |
| convene |
to gather or assemble, esp. for a formal meeting. [3 definitions] |
| convenience |
the quality of being suitable or handy for one's purpose or need. [4 definitions] |
| convenience food |
partially or fully processed food, such as a frozen meal, that can be quickly prepared. |