Exines | definition of exines by Medical dictionary
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exine (ĕk′sēn′, -sīn′)
The outer layer of the wall of a spore or pollen grain.
exine the outer coat of a POLLEN GRAIN, that often has protuberances, spines, etc. The exine also has one or more areas where the wall is thin, forming a pore through which the pollen tube will protrude.