phyllode
noun
phyl·lode ˈfi-ˌlōd 
: a flat expanded petiole that replaces the blade of a foliage leaf, fulfills the same functions, and is analogous to a cladophyll
Word History
Etymology
New Latin phyllodium, from Greek phyllōdēs like a leaf, from phyllon leaf
First Known Use
1848, in the meaning defined above
Medical Definition
phyllode
adjective
phyl·lode ˈfil-ˌōd
: having a cross section that resembles a leaf
phyllode tumors of the breast