ˌprī(ˌ)mōˈfiləˌsēz noun plural
Usage: capitalized
Etymology: New Latin, from Latin primo + New Latin Filices
in some classifications : a subclass of Filicineae comprising fossil forms with the axis usually protostelic, the fronds but slightly developed, terminal or subterminal sporangia, and usually isospores and including the order Coenopteridales and sometimes other forms of somewhat uncertain relationships