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castellated beam

American

noun

a rolled metal beam the web of which is first divided by a lengthwise zigzag cut, then welded together so as to join the peaks of both halves, thus increasing its depth and strength.

First recorded in 1670–80

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023