from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A nonmetallic element, such as arsenic, that has some of the chemical properties of a metal.
  • n. A nonmetallic element, such as carbon, that can form an alloy with metals.
  • adj. Relating to or having the properties of a metalloid.
  • adj. Having the appearance of a metal.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An element, such as silicon or germanium, intermediate in properties between that of a metal and a nonmetal; especially one that exhibits the external characteristics of a metal, but behaves chemically more as a nonmetal.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having the appearance of a metal.
  • adj. Having the properties of a nonmetal; nonmetallic; acid; negative.
  • n. Formerly, the metallic base of a fixed alkali, or alkaline earth; -- applied by Sir Humphrey Davy to sodium, potassium, and some other metallic substances whose metallic character was supposed to be not well defined.
  • n. Now, one of several elementary substances which in the free state are unlike metals, and whose compounds possess or produce acid, rather than basic, properties; a nonmetal; , are metalloids.

from The Century Dictionary and Cyclopedia

  • Relating to metalloids; like metal; having the form or appearance of a metal.
  • n. In chem., a term which has been variously applied: as
  • n. to the metallic bases of the fixed alkalis and alkaline earths, probably in consequence of their low specific gravity; and
  • n. to all the non-metallic elementary substances.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. of or being a nonmetallic element that has some of the properties of metal


Sorry, no etymologies found.


  • Silicon is a chemical element with the metalloid, meaning that it has a silver shine to it, and that it is a moderate conductor, and shares some other properties of non-metals.

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  • As a metalloid, arsenic is a semiconductor, like silicon.


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  • Despite its metallic appearance, it is not considered a metal, but a metalloid.


  • Silicon, atomic number of 14, is a semi-metallic or metalloid, because it has several of the metallic characteristics.


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