a nonmetal that in combination with a metal forms an alloy.
an element that has both metallic and nonmetallic properties, as arsenic, silicon, or boron.
of or pertaining to a metalloid.
resembling both a metal and a nonmetal.

1825–35; metall- + -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
metalloid (ˈmɛtəˌlɔɪd)
1.  a nonmetallic element, such as arsenic or silicon, that has some of the properties of a metal
2.  of or being a metalloid
3.  resembling a metal

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
metalloid   (mět'l-oid')  Pronunciation Key 
  1. An element that is not a metal but that has some properties of metals. Arsenic, for example, is a metalloid that has the visual appearance of a metal, but is a poor conductor of electricity; metalloids are generally semiconductors. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium, and polonium. Metalloids can be viewed as a diagonal section on the Period Table, separating metals from nonmetals.

  2. A nonmetallic element, such as carbon, that can form alloys with metals.

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Example sentences
Geochemical cycles of metals and metalloids in mining-impacted pit lakes.
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