Sentence:  There is evidence , though less convincing than for **f , that the **f bond in <WSD>nickel</WSD> dimethylglyoxime is symmetric . 
Meaning of the word marked with <WSD> tags:  a hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite