
Decipium was the proposed name for a new chemical element isolated by Marc Delafontaine from the mineral samarskite. He published his discovery in 1878 and a follow-up paper in 1881. Later it was shown that decipium was a mixture of samarium and other rare earth elements. ...
Found on
http://en.wikipedia.org/wiki/Decipium

• (n.) A supposed rare element, said to be associated with cerium, yttrium, etc., in the mineral samarskite, and more recently called samarium. Symbol Dp. See Samarium.
Found on
http://thinkexist.com/dictionary/meaning/decipium/
De·cip'i·um noun [ New Latin , from Latin
decipere to deceive.]
(Chemistry) A supposed rare element, said to be associated with cerium, yttrium, etc., in the mineral samarskite, and more recently called
samarium . Symbol Dp. See
Samarium .
Found on
http://www.encyclo.co.uk/webster/D/16
No exact match found.