Examples from the Web for tracheal
Each opening by a separate aperture into the base of the tracheal pit, and measuring about 0.002 mm.The Works of Francis Maitland Balfour, Volume 1|Francis Maitland Balfour
The tracheal opening is not as far forward as in bimaculata, being nearer the spinnerets than the epigynum.The Common Spiders of the United States|James Henry Emerton
These two leaves are supported upon a framework of tracheal tubes.Our Common Insects|Alpheus Spring Packard
Spi' ra cle, an opening into the tracheal breathing organs of insects.A Guide for the Study of Animals|Worrallo Whitney
Even without any deformity the rachitical process is accompanied from an early time with bronchial and tracheal catarrh.