noun Civil Engineering.
a device operating like a balance or seesaw, especially an arrangement of a movable bridge (bascule bridge) by which the rising floor or section is counterbalanced by a weight.

1670–80; French: name for a number of seesawlike mechanical devices, Middle French bacule, noun derivative of baculer to strike on the buttocks (probably orig., to land on one's buttocks), equivalent to bas down (see base2) + -culer, verbal derivative of cul rump, buttocks (see culet); -s- by false analysis as bas(se) adj. + cule taken as a feminine noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bascule (ˈbæskjuːl)
1.  Compare drawbridge balance bridge, Also called: counterpoise bridge a bridge with a movable section hinged about a horizontal axis and counterbalanced by a weight
2.  a movable roadway forming part of such a bridge: Tower Bridge has two bascules
[C17: from French: seesaw, from bas low + cul rump; see base², culet]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The single-bascule leaf not under repair will continue to open for vessels.
Bascule-In layman's terms, the bascule is a drawbridge.
The project included the entire bascule: all of the steel on the south end and the steel-only portions of the north end.
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