noun Botany.
an elongated, tapering xylem cell having lignified, pitted, intact walls, adapted for conduction and support. Compare vessel ( def 5 ).

1870–75; trache(a) + -id3

tracheidal [truh-kee-i-dl, trey-kee-ahyd-l] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tracheid or tracheide (ˈtreɪkɪɪd)
botany an element of xylem tissue consisting of an elongated lignified cell with tapering ends and large pits
[C19: from trachea (in the sense: a vessel in a plant) + -id²]
tracheide or tracheide
[C19: from trachea (in the sense: a vessel in a plant) + -id²]
tracheidal or tracheide

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
tracheid   (trā'kē-ĭd, -kēd')  Pronunciation Key 
An elongated, water-conducting cell in xylem, one of the two kinds of tracheary elements. Tracheids have pits where the cell wall is modified into a thin membrane, across which water flows from tracheid to tracheid. The cells die when mature, leaving only their lignified cell walls. Tracheids are found in all vascular plants. Compare vessel element.
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