Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun atomic_number_21

1 sense of atomic number 21

Sense 1
scandium, Sc, atomic number 21 -- (a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite)
       => metallic element, metal -- (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)