Ovule



[ov-yool, oh-vyool] /ˈɒv yul, ˈoʊ vyul/

noun
1.
Botany.

2.
Biology. a small egg.
/ˈɒvjuːl/
noun
1.
a small body in seed-bearing plants that consists of the integument(s), nucellus, and embryosac (containing the egg cell) and develops into the seed after fertilization
2.
(zoology) an immature ovum
n.

1821, from French ovule and directly from Modern Latin ovulum, literally “small egg,” diminutive of Latin ovum “egg” (see ovum).

ovule o·vule (ō’vyōōl, ŏv’yōōl)
n.

o’vu·lar (ō’vyə-lər, ŏv’yə-) or o’vu·lar’y (-lěr’ē)
ovule
(ō’vyl, ŏv’yl)
The female reproductive structure that develops into a seed in a seed-bearing plant. An ovule consists of a megasporangium surrounded by one or two layers of tissue called integuments. The megasporangium produces spores that develop into megagametophytes. These megagametophytes remain within the tissues of the ovule and produce one or more egg cells. Sperm from pollen grains enter the ovule through an opening called a micropyle and fertilize the egg cells. The resulting embryo then begins to develop within the ovule, which becomes a seed. Among the conifers and cycads, the ovules are typically found in pairs on scales in the female cones. The ovules of angiosperms are contained in a structure called the ovary within in the flower. See more at flower, gametophyte, megasporogenesis, pollination.

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    ovulocyclic o·vu·lo·cy·clic (ō’vyə-lō-sī’klĭk, -sĭk’lĭk, ŏv’yə-) adj. Relating to a phenomenon associated with and recurring at a certain time within the ovulatory cycle.

  • Ovulum

    ovulum o·vu·lum (ō’vyə-ləm, ŏv’yə-) n. See ovule.



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