A metallic chemical element, atomic number 21, obtained from some uranium ores; it is a transition element.

(physics) the only stable isotope of scandium, ⁴⁵₂₁Sc, having twenty-one protons and twenty-four neutrons

(inorganic chemistry) Group 3 of the periodic table, comprising scandium, yttrium, lanthanum and actinium.

(chemistry) Resembling scandium.