Triiodomethane, commonly known as iodoform, is a chemical compound with the formula CHI3. It is a yellow solid that has a distinct medicinal odor. Triiodomethane is primarily used as an antiseptic and in the synthesis of other organic compounds. This compound is notable for its role in the haloform reaction, where it is produced from the reaction of acetone with iodine in the presence of a base. Triiodomethane is also used in laboratories for various applications, including as a reagent in organic chemistry.