Definition of pollen tube noun from the Oxford Advanced Learner's Dictionary

 

pollen tube

 noun
noun
BrE
 
; NAmE
 
(biology)
 
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a tube that grows when pollen lands on the stigma (= a part of the female organ) of a flower to carry the male cell to the ovule (= the part that contains the female cell)
See the Oxford Advanced American Dictionary entry: pollen tube