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The Collaborative International Dictionary
Nucellus

Nucellus \Nu*cel"lus\, n.; pl. Nucelli. [NL., dim. of nux, nucis, a nut.] (Bot.) See Nucleus, 3 (a) .

Wiktionary
nucellus

n. (context botany English) The tissue which surrounds and protects the embryo and lies inside of the integuments.

WordNet
nucellus
  1. n. central part of a plant ovule; contains the embryo sac

  2. [also: nucelli (pl)]