holmia

from The Century Dictionary.

• noun A genus of trilobites belonging to the family Olenidæ and characterized by possessing 10 free segments and a small unsegmented pygidium. It occurs in the Lower Cambrian rooks.
• noun In chem., one of the rare earths, found with yttria in gadolinite, and supposed to be the oxid of a distinct element, holmium: but it may be an as yet unseparated mixture.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) An oxide of holmium.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun inorganic chemistry holmium oxide