tracheid noun. ['treɪkɪɪd] Also (now rare) tracheide. L19.
[German Tracheïde, from TRACHEA + -ide -ID².]
Botany. A type of tracheary element (found esp. in gymnosperms and ferns) which lacks a perforation plate. Cf. VESSEL noun¹ 5b.

■ tracheidal [trǝ'ki:ɪd(ǝ)l] adjective L19.

[TahlilGaran] English Dictionary ▲