un·un·quad·i·um (?-n?n?kw?d??-?m)n. See element 114.[Latin ?nus, one; see oi-no- in Indo-European roots + Latin ?nus + Latin quad(ri)-, quadri- + -ium (in reference to its atomic number).]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.