adj having the appearance of a metal.
2. metalloid ·adj having the properties of a nonmetal; nonmetallic; acid; negative.
3. metalloid ·noun 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.
4. metalloid ·noun 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.