A 190,000-letter word is the chemical name for the protein titin.
According to information available, the longest word in the English language, technically speaking, is the scientific name for the largest protein in the human body, scientifically known as 'titin.' This word is "Methionylthreonylthreonylglutaminylarginyl…isoleucine" and it is made up of over 190,000 letters.
