The Collaborative International Dictionary
Monometallic
Monometallic \Mon`o*me*tal"lic\, a. Consisting of one metal; of or pertaining to monometallism.
Douglas Harper's Etymology Dictionary
Wiktionary
monometallic
a. 1 Consisting of a single metal 2 (context economics English) Of or pertaining to monometallism
WordNet
monometallic
adj. containing one atom of metal in the molecule; "monometallic carbonyls"