Oxalic is a term used to describe a substance that is derived from oxalic acid. This acid is found in many plants, including rhubarb, spinach, and beetroot. Oxalic acid is also used in cleaning products and is known for its ability to remove rust and stains. There are a few different synonyms for the word oxalic, including ethanedioic, dicarboxylic, and oxalacetic. These terms are all related to the chemical structure of oxalic acid and are commonly used in scientific and chemical contexts. While they may not be commonly known outside of these fields, they are important for understanding the properties and uses of oxalic acid.