Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
Related to nucellus: tube nucleus


 (no͞o-sĕl′əs, nyo͞o-)
n. pl. nu·cel·li (-sĕl′ī) Botany
The central portion of an ovule in which the embryo sac develops.

[New Latin, from nux, nuc-, nut.]

nu·cel′lar adj.


n, pl -li (-laɪ)
(Botany) the central part of a plant ovule containing the embryo sac
[C19: New Latin, from Latin nucella, from nux nut]
nuˈcellar adj


(nuˈsɛl əs, nyu-)

n., pl. -cel•li (-ˈsɛl aɪ)
the central cellular mass of the body of the ovule, containing the embryo sac.
[1880–85; < New Latin < Latin nuc- (s. of nux) nut]
nu•cel′lar, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.nucellus - central part of a plant ovulenucellus - central part of a plant ovule; contains the embryo sac
ovule - a small body that contains the female germ cell of a plant; develops into a seed after fertilization
plant part, plant structure - any part of a plant or fungus
References in periodicals archive ?
123 Nucellus (0) crassinucellar (including weakly so), (1) tenuinucellar or pseudocrassinucellar.
April 27 ~April 30###Microspore mother cell stage###The nucellus started protrusions
alata are anatropous, subglobose, bitegmic, and crassinucellate, with a narrow conical nucellus (see Figure 4D, E).
The ovule is anatropous, presenting micropyle, funicle, inner and outer integument and nucellus in both floral types.
Moreover, according to Amato and Elias (2005), the hydrothermal treatment allows the outer layers (which form the pericarp, tegument, the nucellus, and aleurone cells of the endosperm and part of the embryo, especially the scutellum) to be partially loosened and aggregated into the starchy endosperm of the caryopsis, so that the embryo remains in place, not easily detached during hulling, causing the increment observed in this study.
In addition to the sexual or zygotic embryo, most citrus seeds also present nucellar embryos, formed by somatic nucellus cells, characterizing the nucellar polyembryony (FROST; SOOST, 1968).
According to Maheshwari (1950), supernumerary embryos of sporophytic nature can originate from nucellus or integuments cells, by zygote or pro-embryo cleavage and differentiation of suspensor cells.
The ovule develops two outer layers, the integuments, which enclose the nucellus tissue within.
The results proved that ASBVd was not eliminated via nucellus culture, although it showed that somatic embryogenesis can be used as a practical approach to inducing, multiplying and maintaining ASBVd-infected material for extended periods of times for research purposes.
Since the outer cotyledon adhered to the remaining nucellus (perisperm) and seed coat tissues during milling of dry seeds, the bran milling fraction containing embryo fragments was a good source of fagopyritols (Steadman et al., 2000).
Hyphae grow into ovules as the inflorescences develop and proliferate in the nucellus tissues, where they become incorporated into seeds (White et al.