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nucellus

American  
[noo-sel-uhs, nyoo-] / nuˈsɛl əs, nyu- /

noun

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


nucellus British  
/ njuːˈsɛləs /

noun

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

nucellus Scientific  
/ no̅o̅-sĕləs /
nucelli plural
  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.


Other Word Forms

Etymology

Origin of nucellus

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

As the first integument grows round it, the amount of inversion increases, and the funicle becomes adherent to the side of the nucellus.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various

A young ovule consists of a conical nucellus surrounded by a single integument terminating as a two-lipped micropyle.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" by Various

The plants included are, however, mainly well-established parasites, and the absence of nucellus is only one of those characters of reduction to which parasites are liable.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various

As the endosperm increases in size along with the embryo-sac and the embryo, the substance of the original nucellus of the ovule is gradually absorbed.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" by Various

In gymnosperms the pollen-tubes, having penetrated a certain distance down the tissue of the nucellus, are usually arrested in growth for a longer or shorter period, sometimes nearly a year.

From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various

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