Noun | 1. | ![]() germ cell, reproductive cell, sex cell - a spermatozoon or an ovum; a cell responsible for transmitting DNA to the next generation anisogamete - either of a pair of unlike gametes especially those unlike in size isogamete - either of a pair of conjugating gametes of the same size and structure sperm, sperm cell, spermatozoan, spermatozoon - the male reproductive cell; the male gamete; "a sperm is mostly a nucleus surrounded by little other cellular material" spermatid - an immature gamete produced by a spermatocyte; develops into a spermatozoon oosphere - a gamete; used especially of lower plants antherozoid, spermatozoid - a motile male gamete of a plant such as an alga or fern or gymnosperm |