pollen tube

pollen tube

noun Botany.
the protoplasmic tube that is extruded from a germinating pollen grain and grows toward the ovule.

Origin:
1825–35

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Collins
World English Dictionary
pollen tube
 
n
a hollow tubular outgrowth that develops from a pollen grain after pollination, grows down the style to the ovule, and conveys male gametes to the egg cell

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pollen tube  
The slender tube that is formed after pollination by division of the tube cell in a pollen grain. The pollen tube penetrates the ovule and releases the male gametes.
The American Heritage® Science Dictionary
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