of or pertaining to the lion.
resembling or suggestive of a lion.
(usually initial capital letter) of or pertaining to Leo, especially Leo IV or Leo XIII.

1350–1400; Middle English leonyn < Latin leōnīnus lionlike, equivalent to leōn- (stem of leō lion) + -īnus -ine1

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World English Dictionary
leonine (ˈliːəˌnaɪn)
of, characteristic of, or resembling a lion
[C14: from Latin leōnīnus, from leō lion]

Leonine (ˈliːəˌnaɪn)
1.  connected with one of the popes called Leo
2.  Leonine City a district of Rome on the right bank of the Tiber fortified by Pope Leo IV
3.  of or relating to certain prayers in the Mass prescribed by Pope Leo XIII
4.  Also called: Leonine verse
 a.  a type of medieval hexameter or elegiac verse having internal rhyme
 b.  a type of English verse with internal rhyme

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Word Origin & History

late 14c., from L. leoninus "belonging to or resembling a lion," from leo (gen. leonis) "lion." Weekley thinks that Leonine verse (1658), rhymed in the middle as well as the end of the line, probably is from the name of some medieval poet, perhaps Leo, Canon of St. Victor, Paris, 12c.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

leonine le·o·nine (lē'ə-nīn)
Of, relating to, or characteristic of a lion.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
His style is donnish-tweed jacket, rumpled trousers, shock of gray hair-but his aura is leonine.
They all evolved from a single ancestor, probably in a bid to confuse the leonine immune system.
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