Definition from Wiktionary, the free dictionary
metalloid (plural metalloids)
- (chemistry) An element, such as silicon or germanium, intermediate in properties between that of a metal and a nonmetal; especially one that exhibits the external characteristics of a metal, but behaves chemically more as a nonmetal.
- (chemistry, 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.
- (Can we find and add a quotation of Sir Humphry Davy to this entry?)