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1. The killing of a tyrant or despot.
2. One who kills a tyrant or despot.

[Greek turannos, tyrant + -cide.]

ty·ran′ni·ci′dal (-sīd′l) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Another of Cervantes's recourses to Latin, which is found in Don Quijote's last letter to Governor Sancho, "Plato amicus, sed magis amica veritas" 'Plato is a friend, but a greater friend is the truth," harmonizes perfectly with the antimonarchical neo-Aristotelian melancholy of late Scholastics like Mariana Which is to say that there is something not just "curiously impertinent" about Don Quijote, but that, as per so many of its aspects, such as the lion episode, the aborted nostalgia for Aragon, and the consistent pro-Morisco theme, there is in fact something downright tyrannicidal about the novel.
In conjuring her the playwrights have done some delicate work with Controversia II.v, in which the wife, having been physically broken in maintaining her silence to protect her tyrannicidal husband, sues him for ingratitude, now that he has slain the tyrant and tried to divorce her in order to find a new wife in better childbearing condition.
This explains why Philip III welcomed the tyrannicidal De rege as an advice book that represented his own virtue as a ruler.