Celtium \Cel"ti*um\, n. [NL.] (Chem.)
The first proposed name for a supposed new element of the
rare-earth group, accompanying lutecium and scandium in the
gadolinite earths. It is now considered identical to
{Lutetium}. The proposed symbol was Ct (no period), but this
name and symbol are no longer used.
[Webster 1913 Suppl. +PJC]