Phylliform refers to the shape or structure that resembles a leaf. Some synonyms for the word phylliform include leaf-like, foliaceous, and foliiform. Leaf-like describes something that has the appearance or structure of a leaf, while foliaceous refers to something that resembles or has characteristics of a leaf. Foliiform, on the other hand, is used to describe the shape of something that resembles a leaf in terms of its overall structure. Other possible synonyms for phylliform may include frondescent, leafy, and leafish. These words can be used interchangeably depending on the specific context and intended meaning.