Answer: rhenium

AnswerCrossword Clue
RHENIUMRe, to chemists
RHENIUMRare metal
RHENIUMChemical element.
RHENIUMAtomic number 75
rheniumrare metallic element of the manganese subgroup: used, because of its high melting point, in platinum-rhenium thermocouples. Symbol: Re; at. no.: 75; at. wt.: 186.2