
• (n.) A transparent, extensible membrane of extreme tenuity, which forms the innermost coating of grains of pollen.
Found on 
http://thinkexist.com/dictionary/meaning/intine/

(from the article `pollen`) ...consists of three distinct parts. The central cytoplasmic part is the source of nuclei responsible for fertilization. The other parts constituting ... ...the microsporocytes or lose their inner cell walls, dissociate from each other, and become amoeboid among the microsporocytes. The pollen grains ... [...
Found on 
http://www.britannica.com/eb/a-z/i/34

<plant biology> Inner layer of the wall of a pollen grain, resembling a primary cell wall in structure and composition. Also used for the inner wall layer of a spore. ... (18 Nov 1997) ... 
Found on 
http://www.encyclo.co.uk/local/20973

Inner layer of the wall of a pollen grain, resembling a primary cell wall in structure and composition. Also used for the inner wall layer of a spore.
Found on 
http://www.encyclo.co.uk/visitor-contributions.php
In'tine  noun [ Latin 
 intus within. Confer 
 Extine .] 
 (Botany) A transparent, extensible membrane of extreme tenuity, which forms the innermost coating of grains of pollen. 
Found on 
http://www.encyclo.co.uk/webster/I/86

the inner coat of a spore, esp. a pollen grain.
Found on 
https://www.infoplease.com/dictionary/intine
  No exact match found.