Meaning of plate girder

plate' gird"er

Pronunciation: [key]
  1. an iron or steel beam built up from plates and shapes welded or riveted together, usually including a plate or plates for a web, four angle irons forming two flanges, and a pair of plates to reinforce the flanges.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.