An atom of an element that exhibits properties that are between those of metals and nonmetals, or that has a mixture of them. The term generally includes boron, silicon, germanium, arsenic, antimony, and tellurium, while carbon, aluminium, selenium, polonium, and astatine are less commonly included.

http://purl.obolibrary.org/obo/CHEBI_137980

An atom of an element that exhibits properties that are between those of metals and nonmetals, or that has a mixture of them. The term generally includes boron, silicon, germanium, arsenic, antimony, and tellurium, while carbon, aluminium, selenium, polonium, and astatine are less commonly included.

metalloid atom

CHEBI:137980

metalloid atom

http://purl.obolibrary.org/obo/CHEBI_33250