Oospheres are spherical gametes that are found in some algae and plants. Synonyms for oospheres include egg cells, ovums, ova, and female gametes. These terms are interchangeable and refer to the reproductive cell that is fertilized by a male gamete during sexual reproduction. Oospheres are an important component of the reproductive cycle of many organisms and are essential for the continuation of their species' genetic material. By understanding the different words used to describe oospheres, one can gain a more complete understanding of the reproductive processes of algae and plants, and the evolutionary history of these organisms.