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(Science: chemical) An alloy of 60% cobalt, 20% chromium, 5% molybdenum, and traces of other substances. It is used in dentures, certain surgical appliances, prostheses, implants, and instruments.

Chemical name: Cobalt alloy, base, co 56-68,Cr 25.00-29.00,Mo 5.00-6.00,Ni 1.75-3.75,Fe 0-3.00,Mn 0-1.00,Si 0-1.00,C 0.20-0.30,B 0-0.007 (UNS R30021)