təˈridəˌspərm, ˈterəd- noun
Etymology: International Scientific Vocabulary pterid- + sperm
: a fossil plant of the order Cycadofilicales : seed fern
təˈridəˌspərm, ˈterəd- noun
Etymology: International Scientific Vocabulary pterid- + sperm
: a fossil plant of the order Cycadofilicales : seed fern
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012