Definition of marsileaceous in US English:

marsileaceous

(also marsiliaceous)

adjective

Botany
rare
  • Belonging to or resembling the Marsileaceae, a family of aquatic ferns of which Marsilea is the type genus.

Origin

Mid 19th century; earliest use found in Robert Mayne (1808–1868). From Marsilea + -aceous, after scientific Latin Marsileaceae, family name.

Pronunciation

marsileaceous

/mɑːsɪlɪˈeɪʃəs/