Isoetales Isoetaceae • Isoetes · · · Info · Definitions · Characters · · Isoetales · · Text Latin · · Script 9 · · Length Definitions · · · (noun) aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales. Synonyms: order Isoetales. · · Noun Definition 1 Characters · · I latin capital letter i U+0049 a latin small letter a U+0061 e latin small letter e U+0065 l latin small letter l U+006C o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074