metalloid

noun

1. An element, such as silicon or germanium, intermediate in properties between that of a metal and a nonmetal; especially an elemental semiconductor.
2. (obsolete)The metallic base of a fixed alkali, or alkaline earth; applied to sodium, potassium, and some other metallic substances whose metallic character was supposed to be not well defined.

   “By some they [metals of the alkalies] were called metalloids; by some their simple nature was objected to”

3. (obsolete)A nonmetal.

adj

1. (not-comparable)Of or relating to the metalloids.
2. (informal)Characteristic of the metal music genre.

   “Graham Massey of 808 State turns a Björkian moan into a vibrating siren and powers his strangely metalloid version of "Army Of Me" with it; the Brodsky String Quartet turns "Hyperballad" into a stately 3-D chess game.”

   “It expanded from bleary delay rippling with looped phrases to embrace molten metalloid raunch and blues grit, acoustic guitars and pedal steels.”