Meaning of siphonostele

si•phon•o•stele

Pronunciation: (sī-fon'u-stēl", sī'fu-nu-stēl"), [key]
— n. Bot.
  1. a hollow tube of vascular tissue enclosing a pith and embedded in ground tissue.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.