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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.

Etymology

Origin of castellated beam

First recorded in 1670–80

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

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.