celtium

Noun

 * 1)   chemical element number 72, now called ; the discoverer,, conjectured it to be a rare earth element, and proposed the symbol Ct), but subsequent work demonstrated it to be a transition element, and hafnium was given the symbol Hf.

Synonyms

 * keltium (symbol Kt)

Noun

 * 1) carapace, tortoise shell