one of the paired hinged shells of certain molluscs and of brachiopods | the act of escaping physically |
the entire one-piece shell of a snail and certain other molluscs | nonperformance of something distasteful (as by deceit or trickery) that you are supposed to do |
control consisting of a mechanical device for controlling the flow of a fluid | an inclination to retreat from unpleasant realities through diversion or fantasy |
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone | an avoidance of danger or difficulty |
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it | a means or way of escaping |
| a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level |
| the discharge of a fluid from some container |
| a plant originally cultivated but now growing wild |