a. [ad. mod.L. trāchēālis, f. prec.: see -AL.]

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  1.  Anat. and Zool. a. Of, pertaining to, or connected with the trachea or windpipe.

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  Tracheal artery: † (a) = TRACHEA 1 a (obs.); (b) each of the small arteries, branches of the inferior thyroid, which supply the trachea.

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1710.  T. Fuller, Pharm. Extemp., 271. The Remedy … is convey’d … into the Tracheal Ducts.

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1725.  Bradley’s Fam. Dict., s.v. Spitting of blood, If it [the Blood] proceeds from the Oesophagum,… or from the Stomach, Lungs, Tracheal Artery, or the Breast.

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1849.  Lytton, Caxtons, II. iii. Coughing is either a tracheal, bronchial, pulmonary, or ganglionic affection.

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1857.  Dunglison, Med. Lex., Tracheal Glands, mucous follicles on the posterior surface of the trachea.

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1881.  Mivart, Cat, 227. The tracheal cartilages.

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  b.  Pertaining to or of the nature of the tracheæ of insects and other arthropods; connected with tracheæ, as tracheal gills; performed by means of tracheæ, as tracheal respiration. (In quot. 1899 = TRACHEATE a.)

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1826.  Kirby & Sp., Entomol., IV. xxxviii. 64. The ramifications of the tracheal tree may be seen without dissection.

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1888.  Rolleston & Jackson, Anim. Life, 505 (Insecta). Respiration is tracheal…. Each stigma leads into a single tracheal stem, rarely into several.

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1899.  Allbutt’s Syst. Med., VIII. 865. The tracheal order of the Arachnidæ.

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  2.  Bot. Of the nature of, or composed of, tracheæ: see prec. 2.

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1828.  Stark, Elem. Nat. Hist., II. 454. The Monocotyledonous vegetables have, besides this cellular tissue, porous and tracheal vessels.

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1885.  Goodale, Physiol. Bot., § 265. 81. To this class of elements it is difficult to give any satisfactory name…. The name Tracheal (or Tracheary),… while it is a significant term when applied to trachea-like bodies (ducts) is a misnomer when applied to an elongated cell wholly free from annular or spiral markings.

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