SG Heritage Dictionary

Metalloid [Noun] Webster's Dictionary 1828

A name sometimes applied to the metallic bases of the alkalies and earths.

Metalloid [Adjective] Webster's Dictionary 1913

1. Having the appearance of a metal.

2. Having the properties of a nonmetal; nonmetallic; acid; negative.

Metalloid [Noun] Webster's Dictionary 1913

1. Formerly, the metallic base of a fixed alkali, or alkaline earth; -- applied by Sir H. Davy to sodium, potassium, and some other metallic substances whose metallic character was supposed to be not well defined.

2. 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.

Metalloidal [Adjective] Webster's Dictionary 1828

Having the form or appearance of a metal.

Metalloidal [Adjective] Webster's Dictionary 1913

Metalloid.