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From The Collaborative International Dictionary of English v.0.48:
Ovism \O"vism\, n. [Ovum + -ism.] (Zool.) The old theory that the egg contains the whole embryo of the future organism and the germs of all subsequent offsprings and is merely awakened to activity by the spermatozoon; -- opposed to spermism or animalculism. [Webster 1913 Suppl.]