NOUN (2)

1. a small body that contains the female germ cell of a plant; develops into a seed after fertilization;

2. a small or immature ovum;

The Collaborative International Dictionary of English v.0.48:

Ovule \O"vule\, n. [Dim. of L. ovum an egg: cf. F. ovule. Cf.
   Ovolo, Ovulum.] (Biol.)
   (a) The rudiment of a seed. It grows from a placenta, and
       consists of a soft nucleus within two delicate coatings.
       The attached base of the ovule is the hilum, the coatings
       are united with the nucleus at the chalaza, and their
       minute orifice is the foramen.
   (b) An ovum.
       [1913 Webster]

WordNet (r) 3.0 (2006):

ovule
    n 1: a small body that contains the female germ cell of a plant;
         develops into a seed after fertilization
    2: a small or immature ovum

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "ovule":
   albumen, caviar, egg, egg cell, egg white, eggshell, ellipse,
   female gamete, fish eggs, glair, ooecium, oval, ovicell, ovoid,
   ovum, roe, spawn, stirp, vitellus, white, yellow, yolk