t(elevision) i(nfra)r(ed) o(bservational) s(atellite)

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noun, plural tiros.
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World English Dictionary
tiro (ˈtaɪrəʊ)
n , pl -ros
a variant spelling of tyro

Tiros (ˈtaɪrəʊs)
one of a series of US weather satellites carrying infrared and television camera equipment for transmitting meteorological data to the earth
[C20: from T(elevision and) I(nfra-)R(ed) O(bservation) S(atellite)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Abbreviations & Acronyms
  1. Television and Infrared Operational Satellite

  2. Television Infrared Observation Satellite

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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