mercury1 2022.12.06 mercuryとは 意味・定義・例文 Noun 名詞 1. a chemical element that is a heavy silver-white poisonous liquid at a normal temperature 水銀 Mercury is a liquid. Mercury1 2022.12.06 Mercuryとは 意味・定義・例文 Noun 名詞 1. the planet that is nearest the sun 水星 Mercury is a rocky planet with a huge iron core which makes up a large part of its interior.