Definition: Arsenic is a chemical element in the periodic table, symbol As. It is often associated with the Roman goddess Diana, representing love, power, and the goddesses of victory. The word "Arsenal" is used to describe a location or place where weapons are stored, often for protection against attackers or emergencies. The definition of arsenical would be: a chemical compound that's found in arsenic, an element with high atomic number (atomic number 94) and atomic mass (molar mass 138.25 g/mol). The substance can be used to create explosives and other weapons for use in warfare or destruction.