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.
[ 1670-80 ]
CASTELLATED BEAM
Meaning of CASTELLATED BEAM in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012