The Collaborative International Dictionary
Phyllotaxy
Phyllotaxy \Phyl"lo*tax`y\, Phyllotaxis \Phyl"lo*tax`is\, n. [Phyllo- + Gr. ta`xis order.] (Bot.) The order or arrangement of leaves on the stem; the science of the relative position of leaves.
Wiktionary
phyllotaxy
n. phyllotaxis