| Metalloid 1. (n.) 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. 2. (n.) 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. 3. (a.) Having the appearance of a metal. 4. (a.) Having the properties of a nonmetal; nonmetallic; acid; negative. Thesaurus Entries bar, button, cast, casting, coin gold, coin silver, copper, earth metals, gate, gold, gold dust, gold nugget, ingot, metal, metal foil, metal leaf, metalleity, metallicity, metallics, metalloid, metalware, metalwork, native metals, nickel, noble metals, nugget, pig, precious metals, rare metals, regulus, semimetal, sheet metal, silver, sow, yellow stuff |