Bot. a type of long, thick-walled, tubelike, nonliving cell found in xylem, esp. of the conifers
Origin of tracheidtrache(o)- + -id
A dead, water-conducting cell in the xylem of vascular plants, having tapered ends and pits in the cell wall but lacking the perforations found in a vessel element.
- (botany) A tracheid cell.