Poison mercury is a dangerous substance that can cause serious health hazards when exposed to it. It is commonly found in thermometers, fluorescent light bulbs, and old-fashioned blood pressure devices. To avoid its harmful effects, it is important to be aware of its synonyms so that it can be avoided at all costs. Some of the synonyms of poison mercury include quicksilver, mercurial, cinnabar, and hydrargyrum. Knowing these synonyms can help us identify and avoid products that contain mercury, thus protecting our health and the environment. It is always better to be cautious and stay away from any products containing poison mercury.