ˈperə+ noun
Etymology: French péricycle, from Greek perikyklos, adjective, spherical, extending all around, from peri- + kyklos circle, wheel — more at wheel
: a layer of parenchymatous or sclerenchymatous cells from one to a few cells thick and in some cases discontinuous that sheathes the stele especially of the root of most vascular plants and in roots is associated with the formation of vascular cambium, phellogen, and lateral roots — called also pericambium