nucellus

[ noo-sel-uhs, nyoo- ]

noun

, Botany.

, plural nu·cel·li [noo-, sel, -ahy, nyoo-].

1. the central cellular mass of the body of the ovule, containing the embryo sac.

nucellus

/ njuːˈsɛləs /

noun

1. the central part of a plant ovule containing the embryo sac

nucellus

/ no̅o̅-sĕl′əs /

, Plural nucelli no̅o̅-sĕl′ī

1. 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.

Derived Forms

• nuˈcellar, adjective

Other Words From

• nu·cellar adjective

Word History and Origins

Origin of nucellus¹

1880–85; < New Latin, equivalent to Latin nuc- (stem of nux ) nut + -ella -elle

Word History and Origins

Origin of nucellus¹

C19: New Latin, from Latin nucella, from nux nut

Example Sentences

A papery remnant of nucellus lines the inner face of the woody shell, and, as in cycadean seeds, the apical portion is readily separated as a cap covering the summit of the endosperm.

From Project Gutenberg

The vessels of the cord are prolonged to the base of the nucellus n by means of the raphe r.

From Project Gutenberg

There are thus two integuments to the nucellus, an outer and an inner.

From Project Gutenberg

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

From Project Gutenberg

Each ovule is enclosed at the base by an envelope or collar homologous with the lamina of a leaf; the fleshy and hard coats of the nucellus constitute a single integument.

From Project Gutenberg