According to the Book of Mormon, the branch of Lehi’s descendants that became unfaithful. (The Book of Mormon says that Lehi was a Jew who traveled to the Americas around 600 B.C.) Mormons believe they became the ancestors of the American Indians.
Dictionary of Mormonese
Dictionary of "Mormonese"
Stop talking past each other. Gain a better understanding of the words that are unique to Mormonism and the differences of shared terms between Mormonism and Christianity.