con·nate

[kon-eyt]
adjective
1.
existing in a person or thing from birth or origin; inborn: a connate sense of right and wrong.
2.
associated in birth or origin.
3.
allied or agreeing in nature; cognate.
4.
Anatomy. firmly united; fused.
5.
Botany. congenitally joined, as leaves.
6.
Geology. trapped in sediment at the time the sediment was deposited: connate water.

Origin:
1635–45; < Late Latin connātus (past participle of connāscī to be born at the same time with), equivalent to Latin con- con- + nā- (short stem of nāscī) + -tus past participle suffix (see nascent)

con·nate·ly, adverb
con·nate·ness, noun
con·na·tion [kuh-ney-shuhn] , noun
sub·con·nate, adjective
sub·con·na·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Connate is always a great word to know.
So is iris. Does it mean:
the colored portion of the eye that contains a circular opening, the pupil, in its center
either one of the seventh pair of cranial nerves composed of motor fibers that control muscles of the face except those used in chewing
Collins
World English Dictionary
connate (ˈkɒneɪt) [Click for IPA pronunciation guide]
 
adj
1.  existing in a person or thing from birth; congenital or innate
2.  allied or associated in nature or origin; cognate: connate qualities
3.  biology Also called: coadunate (of similar parts or organs) closely joined or united together by growth
4.  geology (of fluids) produced or originating at the same time as the rocks surrounding them: connate water
 
[C17: from Late Latin connātus born at the same time, from Latin nātus, from nāscī to be born]
 
'connately
 
adv
 
'connateness
 
n

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

connate
1640s, from L. connatus "born together, twins," pp. of connasci "to be born together," from con- "together" + nasci "to be born" (Old L. gnasci; see genus). Related: Connation (1846).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
connate   (kŏn'āt', kŏ-nāt')  Pronunciation Key 
Botany Joined with a part or organ of the same kind, as leaves that are joined at the base. Compare adnate.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Compatibility tests of injection fluid with reservoir or formation connate waters are sometimes necessary.
Long-range migration of formation fluids generally dilutes connate water.
Connate water is water trapped in the interstices of sedimentary rocks at the time of their deposition.
Ions in connate water come from the dissociation of salts and provide for the flow of electric current.
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