Nickel

n. coin worth 5 cents (used in USA and Canada); (Ni) hard silvery metallic pliable element used in metal alloys (Chemistry)

Nickel (IPA: ) is a metallic chemical element in the periodic table that has the symbol Ni and atomic number 28.
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Nickel /nick·el/ a chemical element, at. no. 28. Long-term exposure to metallic nickel, as in jewelry, can cause contact dermatitis; nickel fumes [more]Nickel - Community and Resources

Noun
1. a hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite
(synonym) Ni, atomic number 28
(hypernym) metallic element, metal
(substance-holonym) garnierite
2. a United States coin worth one twentieth of a dollar
(hypernym) coin
3. five dollars worth of a drug; "a nickel bag of drugs"; "a nickel deck of heroin"
(synonym) nickel note
(hypernym) fiver, five-spot, five dollar bill
Verb
1. plate with nickel; "nickel the plate"
(hypernym) plate
(derivation) Ni, atomic number 28

n. nickel, hard silvery metallic pliable element used in metal alloys (Chemistry); coin worth 5 cents