intermetallic
adjective
in·ter·me·tal·lic ˌin-tər-mə-ˈta-lik 
: composed of two or more metals or of a metal and a nonmetal
especially : being an alloy having a characteristic crystal structure and usually a definite composition
intermetallic compound
intermetallic noun
Word History
First Known Use
1900, in the meaning defined above