Meaning of protoderm

pro•to•derm

Pronunciation: (prō'tu-dûrm"), [key]
— n. Bot.
  1. a thin outer layer of the meristem in embryos and growing points of roots and stems, which gives rise to the epidermis. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.