a rare, trivalent, silvery, metallic chemical element found in combination in gadolinite, monazite
sand, samarskite, etc.: used in color TV tubes, alloys, etc.: symbol, Y; at. no., 39 see the periodic table of elements in the Reference Supplement
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'yttrium'
ModL < yttria
: name proposed (1822) before isolation of the element by Mosander (see erbium
) in 1843