Meaning of foamed metal

foamed' met'al

Pronunciation: [key]
— Chem., Chem.,Metallurgy.
  1. a uniform foamlike metal structure produced when hydrogen bubbles are evolved from metal hydrides uniformly dispersed throughout a host metal or metal alloy: used as a structural material because of its shock-absorbing properties and light weight.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.