Added 10 October 2026 hg symbol Categories: NatureDescribing WordsUncommon Words symbol ! Definition from Wiktionary (CC BY-SA). More about hg at Wordnik → Where our words come from → Symbol for hectogram, an SI unit of mass equal to 10 grams. Related Words: mercuryquicksilverhectogrambpbaasembracecuddlesqueezeclaspsnuggleclinch Back to today's word