The Collaborative International Dictionary of English v.0.48:
phylloclade \phylloclade\, phyllocladium \phyl`lo*cla"di*um\, n.; pl. Phyllocladia. [NL., fr. Gr. fy`llon a leaf + kla`dos a sprout.] (Bot.) A flattened stem or branch which more or less resembles a leaf, and performs the function of a leaf as regards respiration and assimilation. Syn: cladode, cladophyll, phylloclad. [1913 Webster + WordNet 1.5]