Definitions

from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • n. An apparatus that shows how the movement of the earth on its axis and around the sun causes day and night and the seasons.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. an apparatus for exhibiting the mathematical relations of the earth, in which the principles of orthogonal projection are applied.
  • n. An instrument for showing in what manner the causes operate which produce the succession of day and night and the changes of the seasons: a kind of orrery.

Etymologies

New Latin : telluro- + Greek -ion, diminutive suff.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin tellusĀ ("earth") (Wiktionary)

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