The Collaborative International Dictionary
Spermist
Spermist \Sperm"ist\, n. (Biol.) A believer in the doctrine, formerly current, of encasement in the male (see Encasement), in which the seminal thread, or spermatozoid, was considered as the real animal germ, the head being the true animal head and the tail the body.
Wiktionary
spermist
n. (context historical English) One who believed that the complete human being was contained in the sperm rather than the ovum.