Pronunciation: (met'l-oid"), [key]
1. a nonmetal that in combination with a metal forms an alloy.
2. an element that has both metallic and nonmetallic properties, as arsenic, silicon, or boron.
1. of or pertaining to a metalloid.
2. resembling both a metal and a nonmetal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.