Germ may refer to: Microorganism, especially a pathogen; see Germ theory of disease Germ cell, an ovum or sperm, or one of its progenitors The Germ (periodical), a periodical established by the Pre-Raphaelite Brotherhood to disseminate their ideas Germ (mathematics), an object in a topological space that captures local properties Cereal germ, the reproductive part of a cereal grain Germ, Hautes-Pyrénées, a commune of the Hautes-Pyrénées département in southwestern France… (More on Germ)