Dictionary![]() ![]() met•al•loidPronunciation: (met'l-oid"), [key] —n. 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. —adj. 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.
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