The Collaborative International Dictionary of English v.0.48:

Adonist \A*do"nist\ ([.a]*d[=o]"n[i^]st), n. [Heb.
   [a^]d[=o]n[=a]i my Lords.]
   One who maintains that points of the Hebrew word translated
   "Jehovah" are really the vowel points of the word "Adonai."
   See Jehovist.
   [1913 Webster]