a person appointed to rule a country or province as the deputy of the sovereign: the viceroy of India.
a brightly marked American butterfly, Limenitis archippus, closely mimicking the monarch butterfly in coloration.

1515–25; < Middle French, equivalent to vice- vice- + roy king < Latin rēgem, accusative of rēx

viceroyship, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
viceroy (ˈvaɪsrɔɪ)
a governor of a colony, country, or province who acts for and rules in the name of his sovereign or governmentRelated: viceregal
Related: viceregal
[C16: from French, from vice³ + roy king, from Latin rex]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

person ruling as representative of a sovereign, 1524, from M.Fr. vice-roy, from O.Fr. vice- "deputy" (see vice-) + roi "king," from L. regem (nom. rex); see rex. The species of American butterfly so called from 1881.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


one who rules a country or province as the representative of his sovereign or king and who is empowered to act in the sovereign's name. Viceroy (virrey) was the title given to the principal governors of Spain's American colonies, as well as to the governors of the "kingdoms" (reinos) of peninsular Spain proper (e.g., Aragon, Valencia)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
And tasty viceroy butterflies are safe from birds because they resemble monarchs, which are unpalatable.
The monarch butterfly serves as a model for its mimic, the viceroy butterfly.
The viceroy butterfly is named and designated as the state butterfly.
Viceroy butterflies closely resemble monarchs, but are not toxic since the caterpillars do not eat milkweed.
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