in·ter·ne·cine

[in-ter-nee-seen, -sahyn, -nes-een, -nes-ahyn]
adjective
1.
of or pertaining to conflict or struggle within a group: an internecine feud among proxy holders.
2.
mutually destructive.
3.
characterized by great slaughter; deadly.
Also, in·ter·ne·cive [in-ter-nee-siv, -nes-iv] .


Origin:
1655–65; < Latin internecīnus, internecīvus murderous, equivalent to internec(āre) to kill out, exterminate (inter- inter- + necāre to kill) + -īnus -ine1, -īvus -ive

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Internecine is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a stew of meat, vegetables, potatoes, etc.
Collins
World English Dictionary
internecine (ˌɪntəˈniːsaɪn) [Click for IPA pronunciation guide]
 
adj
1.  mutually destructive or ruinous; maiming both or all sides: internecine war
2.  of or relating to slaughter or carnage; bloody
3.  of or involving conflict within a group or organization
 
[C17: from Latin internecīnus, from internecāre to destroy, from necāre to kill]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

internecine
1663, from L. internecinus "very deadly, murderous, destructive," from internecare "kill or destroy," from inter- (q.v.) + necare "kill." Considered in the OED as misinterpreted in Johnson's Dictionary [1755], which defined it as "endeavouring mutual destruction," on association of inter- with "mutual"
when the prefix supposedly is used in this case as an intensive. From Johnson, wrongly or not, has come the main modern definition of "mutually destructive."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But the second category of internecine warfare is really fun to observe.
Power struggles for leadership and control of drug trafficking resources
  provoked internecine warfare among paramilitary groups.
They continue to wage internecine conflicts that cause famine and send refugees
  flowing into neighboring countries.
With little chance of ever achieving political power, they can afford
  internecine warfare.
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