n. [ Ovum + sac. ] (Anat.)
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
n. (Zool.) A believer in ovism. Same as Ovulist. [ 1913 Webster ]