metalloid

[met-l-oid]
noun
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.
adjective
3.
of or pertaining to a metalloid.
4.
resembling both a metal and a nonmetal.

Origin:
1825–35; metall- + -oid

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Collins
World English Dictionary
metalloid (ˈmɛtəˌlɔɪd)
 
n
1.  a nonmetallic element, such as arsenic or silicon, that has some of the properties of a metal
 
adj
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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Encyclopedia Britannica
Encyclopedia

metalloid

a chemical element with properties intermediate between those of typical metals and nonmetals. Usually considered under this classification are the chemical elements boron, silicon, germanium, arsenic, antimony, and tellurium. The rare elements polonium and astatine are also sometimes included. Most of these elements are important industrial materials, being used to make transistors and other semiconductor devices, ceramics, solar batteries, and certain polymers.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Antimony is sometimes referred to as a metalloid, indicating that it displays both metallic and nonmetallic characteristics.
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