noun Fortification.
a V -shaped work, usually projecting from a fortified line.

1680–90; < French, variant of redent a double notching or jagging, equivalent to re- re- + dent tooth < Latin dent- (stem of dēns) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
redan (rɪˈdæn)
a fortification of two parapets at a salient angle
[C17: from French, from earlier redent notching of a saw edge, from re- + dent tooth, from Latin dēns]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The redan is supported vertically by the lower internal structure and seal welded to the core barrel.
The redan is one of the permanent structures within the primary reactor vessel.
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