ˌē(ˌ)ōˌspərməˈtäptərə̇s noun
Usage: capitalized
Etymology: New Latin, from eo- + spermat- + -pteris
: a genus of fossil seed ferns of the Devonian Lavive structure and terminal sporangia similar to those of Psilophyton but lacking the leafiness of the Carboniferous and later ferns