nucellus[no̵̅o̅ sel′əs, nyo̵̅o̅-]
nucellus definition by Webster's New World
noun pl. nucelli
Bot. the central part of an ovule, containing the embryo sac
Origin: Modern Latin ; from Classical Latin nucella, diminutive of nux (gen. nucis), nut
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- nucellar adjective
nucellus definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
noun pl. nu·cel·li Botany
The central portion of an ovule in which the embryo sac develops; the megasporangium.
Origin: New Latin, from nux, nuc-, nut.
- nu·celˈlar adjective
nucellus - Science Definition
Plural nucelli nucelli
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.