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

1655–65; < Latin internecīnus, internecīvus murderous, equivalent to internec(āre) to kill out, exterminate (inter- inter- + necāre to kill) + -īnus -ine1, -īvus -ive Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
internecine (ˌɪntəˈniːsaɪn)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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
The party seems likely to end up with a respectable, mainstream nominee, and no
  internecine warfare to recover from.
Experts believe a range of factors, from internecine warfare to severe drought,
  may have triggered the fall.
They are fervent enough to promote internecine warfare.
Academe has always been fragmented by internecine squabbles about scholarly
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