het·er·o·phyl·lous \|hed.ərō|filəs\adjective Etymology:heter- + -phyllous 1.: having the foliage leaves of more than one form on the same plant or stem < many eucalypts, pondweeds, and crowfoots are heterophyllous > — opposed to isophyllous 2.: having two or more forms of foliation of the septal margins < heterophyllous ammonites > • het·er·o·phyl·ly\ˈ ̷ ̷ ̷ ̷ ̷ ̷ˌfilē\noun-es