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the indefinite boundary in the upper atmosphere beyond which the air is too thin for conventional aircraft to operate.
the region of the upper atmosphere above which aircraft cannot fly


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    the study or collection of airmail stamps, cancellations, etc.

  • Aerophobia

    an abnormal fear of drafts of air, gases, or airborne matter. Historical Examples He was at the same time attacked by aerophobia to a prodigious degree. Louis Pasteur Ren Vallery-Radot noun a pathological fear of draughts of air aerophobia aer·o·pho·bi·a (âr’ə-fō’bē-ə) n. An abnormal fear of air, especially drafts.

  • Aerophone

    any musical wind instrument. Historical Examples He felt unwell; he felt angry; if the aerophone refused to work at all to-morrow, he would care nothing. Stella Fregelius H. Rider Haggard I think, I really think I have nearly perfected my aerophone. Stella Fregelius H. Rider Haggard Can you give me a short description of the […]

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