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tel·lu·ri·on(tĕ-lo͝or′ē-ŏn′) also tel·lu·ri·an (-ən)
An apparatus that shows how the movement of the earth on its axis and around the sun causes day and night and the seasons.
[New Latin : telluro- + Greek -ion, diminutive suff.]
(Astronomy) an instrument that shows how day and night and the seasons result from the tilt of the earth, its rotation on its axis, and its revolution around the sun
[C19: from Latin tellūs the earth]
an apparatus for showing how the orientation and movement of the earth produce the alternation of day and night and the changes of the seasons.
[1825–35; < Latin tellūr-, s. of tellūs earth + Greek -ion diminutive suffix]