Dictionary
foamed' met'al
Chem.,Metallurgy.
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.
Also,foam' met"al.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.