noun U.S. Aerospace.

one of a series of satellites for transmitting television pictures of the earth's cloud cover.

Origin of Tiros

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



noun, plural ti·ros.


or ti·ro


noun, plural ty·ros.

a beginner in learning anything; novice.

Origin of tyro

First recorded in 1605–15, tyro is from the Latin word tīrō recruit
Related formsty·ron·ic [tahy-ron-ik] /taɪˈrɒn ɪk/, adjective

Synonyms for tyro

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tiros

Historical Examples of tiros

  • They always do—men and women, veterans and tiros—and Joyce was no exception.

    The Sixth Sense

    Stephen McKenna

  • If any note were needed here, it might have been devoted to pointing out to tiros the fine subjective touch.

    Ephemera Critica

    John Churton Collins

  • This picture, labeled "No. 1," was the storm that was picked up in the early orbits of Tiros on the first day of launch, April 1.

    The Practical Values of Space Exploration

    Committee on Science and Astronautics

  • Tiros are prone to it, because they at first instinctively endeavour to work with arms rather than with body.


    W. B. Woodgate

  • Tiros will be comforted by hearing that if Curtius is less pleasant to read than Livy, he is also less difficult.

British Dictionary definitions for tiros



one of a series of US weather satellites carrying infrared and television camera equipment for transmitting meteorological data to the earth

Word Origin for Tiros

C20: from T (elevision and) I (nfra-) R (ed) O (bservation) S (atellite)


noun plural -ros

a variant spelling of tyro



noun plural -ros

a novice or beginner
Derived Formstyronic or tironic (taɪˈrɒnɪk), adjective

Word Origin for tyro

C17: from Latin tīrō recruit
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for tiros



1610s, from Medieval Latin tyro, variant of Latin tiro (plural tirones) "young soldier, recruit, beginner," of unknown origin.

Online Etymology Dictionary, © 2010 Douglas Harper