Metalloid /(?)/

Met·al·loid

Metalloid

n.
  1. 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.

Metalloid

a.
  1. Having the appearance of a metal.
  2. Having the properties of a nonmetal; nonmetallic; acid; negative. (Chem.)