GNU Collaborative International Dictionary of English

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1.       
   Bascule , n. [F., a seesaw.] In mechanics, an apparatus on the principle of the seesaw, in which one end rises as the other falls.
   1913 Webster
   Bascule bridge, a counterpoise or balanced drawbridge, which is opened by sinking the counterpoise and thus lifting the footway into the air.
   1913 Webster