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The Collaborative International Dictionary of English v.0.48 (gcide)

Metalloid \Met"al*loid\, n. [L. metallum metal -oid: cf. F.
m['e]tallo["i]de.]
(a) 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.
(b) 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; as, boron, carbon, phosphorus,
nitrogen, oxygen, sulphur, chlorine, bromine, etc.,
are metalloids.
[1913 Webster]


Metalloid \Met"al*loid\, a.
1. Having the appearance of a metal.
[1913 Webster]

2. (Chem.) Having the properties of a nonmetal; nonmetallic;
acid; negative.
[1913 Webster]

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