Breadcrumb Home > Thesaurus > H Synonyms of hg Find synonyms for: Noun 1. mercury, quicksilver, hydrargyrum, Hg, atomic number 80, metallic element, metal usage: a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures 2. hectogram, hg, metric weight unit, weight unit usage: 100 grams WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of hg (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: imbroglio Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language