·noun A mineral of a violet-blue color, inclining to gray and white. It is a hydrous fluoride of cerium, yttrium, and calcium.
·noun A gastropod shell belonging to the family Cerithiidae; — so called from its hornlike form. I...
Webster's Dictionary of the English Language
·noun ·Alt. of Yttro-tantalite. ...
·noun A tantalate of uranium, yttrium, and calcium, of a brown or black color. ...