Definition of knell. 1  transitive verb. : 2  to summon or announce by or as if by a knell. 3  intransitive verb. 4  1 : to ring especially for a death, funeral, or disaster : toll. 5  2 : to sound in an ominous manner or with an ominous effect.
For the journal, see Demography (journal) . Demography is the statistical study of populations, including of human beings. As a very general science, it can analyze any kind of dynamic living population, i.e., one that changes over time or space (see population dynamics).
What do you call a person studying the moon? I agree with the above comments. But if you want to get really  fancy, you could go with Selenographer (a person who charts the  surface of the Moon) or Selenologer (a persoâ¦n who studies the  Moon).