[ek-steen, -stahyn]
noun Botany.

1825–35; < Latin ext(imus) most outward + -ine1

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World English Dictionary
extine (ˈɛkstɪn, -tiːn, -taɪn)
another name for exine
[C19: from Latin extimus outermost + -ine1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
extine   (ěk'stēn', -stīn')  Pronunciation Key 
See exine.
The American Heritage® Science Dictionary
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