sɪˈli:njəm n. Chem. a non-metallic
element occurring
naturally in
various metallic sulphide ores
and characterized by
the variation of
its electrical resistivity with intensity of illumination. °Symb.:
Se. øselenium
cell a
piece of
this used as a
photoelectric device. øøselenate n. selenic adj. selenious adj. [mod.L f. Gk selene
moon + -IUM]