Ephemerist :: Ephemerist (n.) One who studies the daily motions and positions of the planets.
Ephemerist :: Ephemerist (n.) One who keeps an ephemeris; a journalist.
Meristem :: Meristem (n.) A tissue of growing cells, or cells capable of further division..
Mesmerist :: Mesmerist (n.) One who practices, or believes in, mesmerism..