D defs.my
Entry 1 sense Webster, 1913

Decipium

· De·cip·i·um · IPA /dɪˈsɪpɪəm/
01 n. A supposed rare element, said to be associated with cerium, yttrium, etc., in the mineral samarskite, and more recently called samarium. Sy…
  1. 1.
    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.(Chem.) See: Samarium