The crossword solution for the term 'SEAMAN's Saint' is ELMO, which stands for Saint Elmo. Saint Elmo is a Catholic saint who is the patron saint of sailors and seamen. He is also known as Saint Erasmus of Formia and is believed to have been martyred during the persecution of Christians in the Roman Empire. He is often depicted with a flame on his head, representing the lightning that struck him during his martyrdom.