elcesaite

from The Century Dictionary.

• noun One of a party or sect among the Jewish Christians of the second century, deriving their name from Elkasai or Elxai, either their founder or leader, or the title of the book containing their doctrines, which they regarded as a special revelation.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Eccl.) One of a sect of Asiatic Gnostics of the time of the Emperor Trajan.