The Collaborative International Dictionary
Pericambium
Pericambium \Per`i*cam"bi*um\, n. [NL. See Peri-, and Cambium.] (Biol.) A layer of thin-walled young cells in a growing stem, in which layer certain new vessels originate.
Wiktionary
pericambium
n. (context biology English) A layer of thin-walled young cells in a growing stem, where certain new vessels originate.