tracheid

from WordNet (r) 3.0 (2006)
tracheid
    n 1: long tubular cell peculiar to xylem
    
from The Collaborative International Dictionary of English v.0.48
Tracheid \Tra"che*id\, n. (Bot.)
   A wood cell with spiral or other markings and closed
   throughout, as in pine wood.
   [1913 Webster]
    

[email protected]