'Ittrium' definitions:
Definition of 'Ittrium'
From: GCIDE
- Ittrium \It"tri*um\ ([i^]t"tr[i^]*[u^]m), n. [NL.] See Yttrium. [1913 Webster]
Definition of 'ittrium'
From: GCIDE
- Yttrium \Yt"tri*um\, n. [NL., from Ytterby, in Sweden. See Erbium.] (Chem.) A rare metallic element of the boron-aluminium group, found in gadolinite and other rare minerals, and extracted as a dark gray powder. Symbol Y. Atomic number 39. Atomic weight, 88.9. [Written also ittrium.] [1913 Webster +PJC]
- Note: Associated with yttrium are certain rare elements, as erbium, ytterbium, samarium, etc., which are separated in a pure state with great difficulty. They are studied by means of their spark or phosphorescent spectra. Yttrium is now regarded as probably not a simple element, but as a mixture of several substances. [1913 Webster]