Nucellus meaning

no͝o-sĕləs, nyo͝o-
nucelli
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The central portion of an ovule in which the embryo sac develops.
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The central part of an ovule, containing the embryo sac.
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The megasporangium of a seed-bearing plant, located in the ovule. In angiosperms, it is the central portion of the ovule in which the embryo sac develops. In some cases of apomixis (production of seeds without fertilization), cells of the nucellus develop into an embryo.
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(botany) The tissue which surrounds and protects the embryo and lies inside of the integuments.
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Origin of nucellus

  • New Latin from nux nuc- nut

    From American Heritage Dictionary of the English Language, 5th Edition

  • From French nucelle (“little nut"), from Latin nux (“nut").

    From Wiktionary

Nucellus Sentence Examples

  • The development of the ovule, which represents the embryo- Gymnosperms; when mature it consists of one or two sac. coats surrounding the central nucellus, except at the apex where an opening, the micropyle, is left.

  • The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore.

  • In Coelebogyne (Euphorbiaceae) and in Funkia (Liliaceae) polyembryony results from an adventitious production of embryos from the cells of the nucellus around the top of the embryo-sac. In a species of Allium, embryos have been found developing in the same individual from the egg-cell, synergids, antipodal cells and cells of the nucellus.

  • As the development of embryo and endosperm proceeds within the embryo-sac, its wall enlarges and commonly absorbs the substance of the nucellus (which is likewise enlarging) to near its outer limit, and combines with it and the integument Fruit and to form the seed-coat; or the whole nucellus and even the integument may be absorbed.

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