Definition: one of a class of elements having properties intermediate to metals and nonmetals.

Metalloids

Explanation:

Metalloids are compounds whose properties are intermediate between those of metals and non metals. That is, they do not behave as pure metals, neither do they behave as pure nonmetals. For instance, the electrical conductivity of metals decreases with temperature while nonmetals do not conduct electricity at all under any condition. However, metalloids conductivity increases with increase in temperature because they conduct electricity in a manner slightly different from the manner in which metals conduct electricity.