Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The innermost wall of a spore or pollen grain. Also called endosporium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The innermost wall of a spore or pollen grain

from the GNU version of the Collaborative International Dictionary of English

  • n. A transparent, extensible membrane of extreme tenuity, which forms the innermost coating of grains of pollen.

from The Century Dictionary and Cyclopedia

  • n. In botany, the inner coat of the shell of the pollengrains in phenogamous plants, of the spores of fungi, etc. It is a transparent, extensible membrane of extreme tenuity.

Etymologies

German, from Latin intus, within; see en in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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