Definition of tellurians:
(adj) :
(formal or literary) Of or relating to the earth; (specifically, chiefly science fiction) inhabiting planet Earth as opposed to other planets.
(adj) :
(astronomy) Of a planet, being composed primarily of silicate rocks or metals; see also terrestrial planet.
(adj) :
(mineralogy) Of a mineral: containing tellurium.
(n) :
An inhabitant of the Earth.
(n) :
(chiefly science fiction) Alternative letter-case form of Tellurian (“inhabitant of the planet Earth”). [An inhabitant of the Earth.]
(n) :
(astronomy, historical) Alternative spelling of tellurion (“instrument used to show how the rotation of the Earth on its axis and its orbit around the Sun cause day and night and the seasons”). [(astronomy, historical) An instrument used to show how the rotation of the Earth on its axis and its orbit around the Sun cause day and night and the seasons.]