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From The Collaborative International Dictionary of English v.0.48:
Ovulist \O"vu*list\, n. (Biol.) A believer in the theory (called encasement theory), current during the last century, that the egg was the real animal germ, and that at the time of fecundation the spermatozoa simply gave the impetus which caused the unfolding of the egg, in which all generations were inclosed one within the other. Also called ovist. [1913 Webster]