‖ [ L. ] A third somewhat; something mediating, or regarded as being, between two diverse or incompatible substances, natures, or positions. [ Webster 1913 Suppl. ]
n. [ NL., fr. Ytterby, in Sweden. See Erbium. ] (Chem.) A rare metallic element, found in certain minerals, as gadolinite and samarskite, with other rare earths such as ytterbium. Symbol Tb. Atomic number 65. Atomic weight 158.925. [ 1913 Webster +PJC ]
n. [ NL., fr. Ytterby, in Sweden. See Erbium. ] (Chem.) A rare metallic element, found in certain minerals, as gadolinite and samarskite, with other rare earths such as ytterbium. Symbol Tb. Atomic number 65. Atomic weight 158.925. [ 1913 Webster +PJC ]