protostele: Meaning and Definition of

pro•to•stele

Pronunciation: (prō'tu-stēl", -stē"lē), [key]
— n. Bot.
  1. the solid stele of most roots, having a central core of xylem enclosed by phloem.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.