"Dead eyne" is an archaic term used to describe the lifeless eyes of a dead body. Its spelling is influenced by Middle English, where "e" at the end of a word was pronounced as "ə" or "uh." Therefore, the "e" in "eyne" is pronounced as "ə" and the word is pronounced as "ded'əin." The use of the term has declined and is rarely seen in modern English language. Its rarity makes it important for readers to understand its spelling and pronunciation to avoid confusion.