from The Century Dictionary and Cyclopedia
- n. A large conduit for supplying pure air to, or for removing foul or heated air from, theaters, etc.
Sorry, no etymologies found.
Thus when the pupal cuticle is cast, they are readily broken there, and the cuticle of the midge forming beneath has a spiracular opening into the main air-trunk, ready for use during the insect's aerial life.
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