Tracheids are water-conducting cells of the xylem. They are dead and hollow at maturity and have secondary walls.

Tracheids are long, tapered cells similar to the fibers of sclerenchyma. Water passes from one tracheid to the next through pits that penetrate the cell walls.

The lignified walls provide support to the plant.

Tra"che*id (?), n. Bot.

A wood cell with spiral or other markings and closed throughout, as in pine wood.


© Webster 1913.

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