phyllode

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phyl·lode

(fil'ōd),
A flattened leaflike petiole; applied to any structure resembling a leaf, especially to a cross-section of a neoplasm with a foliated structure, such as cystosarcoma phyllodes.
[G. phyllōdēs, like leaves, fr. phyllon, leaf, + eidos, resemblance]

phyllode

an unusual type of leaf in which the lamina is absent but the petiole is so flattened as to appear like a normal leaf, and there is still an axillary bud in the leaf node. Phyllodes are found, for example, in the grass vetch, Lathyrus nissolia.