tylosis: Meaning and Definition of

ty•lo•sis

Pronunciation: (tī-lō'sis), [key]
— pl. -ses
  1. a bubblelike formation in the cavity of tracheids or vessels in the wood of trees, consisting of protoplasm intruded from adjacent parenchyma cells.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.