Se*le"ni*um (?), n. [NL., from Gr.
selh`nh the moon. So called because of its chemical analogy
to tellurium (from L. tellus the earth), being, as it
were, a companion to it.] (Chem.) A nonmetallic element of
the sulphur group, and analogous to sulphur in its compounds. It is
found in small quantities with sulphur and some sulphur ores, and
obtained in the free state as a dark reddish powder or crystalline
mass, or as a dark metallic-looking substance. It exhibits under the
action of light a remarkable variation in electric conductivity, and
is used in certain electric apparatus. Symbol Se. Atomic weight
78.9.
Se*le"ni*um (?), n. [NL., from Gr.
selh`nh the moon. So called because of its chemical analogy
to tellurium (from L. tellus the earth), being, as it
were, a companion to it.] (Chem.) A nonmetallic element of
the sulphur group, and analogous to sulphur in its compounds. It is
found in small quantities with sulphur and some sulphur ores, and
obtained in the free state as a dark reddish powder or crystalline
mass, or as a dark metallic-looking substance. It exhibits under the
action of light a remarkable variation in electric conductivity, and
is used in certain electric apparatus. Symbol Se. Atomic weight
78.9.
