1. (adj) metalloid
having the appearance of a metal
2. (adj) metalloid
having the properties of a nonmetal; nonmetallic; acid; negative
3. (noun) metalloid
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
4. (noun) metalloid
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
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Definitions of metalloid 
