castellated beam

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.

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Origin:
1670–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Castellated beam is always a great word to know.

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the offspring of a zebra and a donkey.

a fool or simpleton; ninny.

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