Definition of micropyle in English:


Syllabification: mi·cro·pyle
Pronunciation: /ˈmīkrəˌpīl


  • 1A small opening in the surface of an ovule, through which the pollen tube penetrates, often visible as a small pore in the ripe seed.
    More example sentences
    • It remains to be studied exactly how the pollen tubes reach the micropyle of the ovules.
    • However, pollen tubes from control pollen showed normal morphology when growing towards the micropyle of an ovule in a HTS plant.
    • Within the ovary, pollen tubes also grew in the ECM to penetrate the micropyle and subsequently grew intercellularly within the nucellus up to the embryo sac.
  • 1.1A small opening in the egg of a fish, insect, etc., through which spermatozoa can enter.
    More example sentences
    • Coupling these screens with a visual assessment of seed formation has yielded mutants defective in FG development or in the ability of pollen tubes to release their sperm after entering the micropyle.
    • In a favorable situation, an opening called the micropyle appears and releases amoebocytes, which differentiate into cells of all the other types.
    • Each cupule is recurved, has a lip-like projection near the point of attachment, and contains several ovules arranged in a curved row with their micropyles facing the cupule opening.



Pronunciation: /ˌmīkrəˈpīlər/
More example sentences
  • Changes in peroxidase activities in the micropylar and the lateral endosperm half of tomato seeds were followed after the beginning of imbibition.
  • The activities of both enzymes increase in a similar temporal manner in the micropylar and lateral endosperm during and following germination.
  • They bear a single wing on one shoulder of the triangular seed body, opposite the tapered, micropylar end, which renders them bilaterally asymmetrical in the plane of compression.


early 19th century: from micro- 'small' + Greek pulē 'gate'.

More definitions of micropyle

Definition of micropyle in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day milord
Pronunciation: mɪˈlɔːd
used to address an English nobleman