of or being a nonmetallic element that has some of the properties of metal; "arsenic is a metalloid element"

an element that has characteristics of both metals and non-metals

an element that has some of the properties of both metals and nonmetals

An element with properties intermediate between metals and non-metals.

an element as specified on the periodic table to be so. Metalloids have some characteristics of metals and some of nonmetals. All metalloids are solid at room temperature.

An element intermediate between metals and nonmetals possessing both metallic and nonmetallic properties, as arsenic, sometimes applied to elements commonly bonded in small amounts in steel, as carbon, manganese, boron, silicon, sulfur, and phosphorus.

an element that has both metallic and nonmetallic properties.

Metalloid is a term used in chemistry, used when classifying the chemical elements. On the basis of their general physical and chemical properties, nearly every element in the periodic table can be termed either a metal or a non-metal - however a few elements with intermediate properties are referred to as metalloids.