pteridospermopsida pteridospermaphytic • pteridospermous · · · Info · Definitions · Characters · · pteridospermopsida · · Text Latin · · Script 18 · · Length 7 · · Syllables Definitions · · · (noun) extinct gymnosperms most of Carboniferous to Jurassic: seed ferns and allies. Synonyms: Pteridospermopsida, class Pteridospermopsida. · · Noun Definition 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074