The Collaborative International Dictionary
Phyllo-
Phyllo- \Phyl"lo-\ A combining form from Gr. ? a leaf; as, phyllopod, phyllotaxy.
Douglas Harper's Etymology Dictionary
phyllo-
before vowels phyll-, word-forming element meaning "leaf," from Greek phyllo-, comb. form of phyllon "leaf," from PIE *bhol-yo- "leaf," suffixed form of root *bhel- (3) "to thrive, bloom" (see folio).
Wiktionary
phyllo-
pre. Forming compound words relating to leaf.