air sacs


air sacs
1. (ARTHROPODA: Insecta)
Pouch-like enlargements of tracheal tubes in winged forms, usually lacking taenidia, capable of inflation and thought to function as an aid in flight and to lessen specific gravity.
2. (CNIDARIA: Hydrozoa)
In Siphonophora, that portion of a pneumatophore that contains gas.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • air sac — 1. a sac containing air. 2. alveolus (def. 2). 3. any of certain cavities in a bird s body connected with the lungs. 4. a saclike dilation of the wall of a trachea in many insects. [1820 30] * * * ▪ anatomy       any of the air filled extensions… …   Universalium

  • air sac — noun 1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways • Syn: ↑alveolus, ↑air cell • Derivationally related forms: ↑alveolate (for: ↑alveolus) • Hypernyms …   Useful english dictionary

  • air cell — noun a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways • Syn: ↑alveolus, ↑air sac • Derivationally related forms: ↑alveolate (for: ↑alveolus) • Hypernyms: ↑ …   Useful english dictionary

  • air embolism — ▪ medical disorder also called  Gas Embolism,         blockage of an artery or vein by an air bubble. Air can be introduced into the blood vessels during surgery or traumatic accidents. One type of traumatic embolization occurs when lung tissue… …   Universalium

  • air-sac disease — noun : a serious inflammatory condition of the air sacs of poultry * * * air sac disease «AIR SAK», chronic respiratory disease in domestic fowl …   Useful english dictionary

  • air-sac mite — noun : a small pale oval nearly hairless mite (Cytoleichus nudus) having the legs ending in suckers and parasitizing the respiratory passages and air sacs of various wild and domesticated birds …   Useful english dictionary

  • air sac — n ALVEOLUS (b) * * * 1. in birds, one of the air filled cavities connected with the air passages of the lungs and usually with cavities in the bones; they assist in respiration and lower the body s specific gravity. Domestic fowl have one or two… …   Medical dictionary

  • Sacs plastiques — Sac plastique Le sac plastique ou sac de caisse est un sac offert, vendu ou prêté par les commerces à leurs clients pour faciliter le transport de leurs achats. Il est, à ce jour, composé essentiellement de polyéthylène. Des sacs en plastique …   Wikipédia en Français

  • Air bag — Coussin gonflable de sécurité Un coussin gonflable de sécurité (appelé couramment en Europe par son nom anglais airbag, littéralement « sac d’air ») est une membrane ou une enveloppe flexible, dans laquelle de l’air ou un autre gaz est… …   Wikipédia en Français

  • Air America — Casquette des aviateurs d Air America Air America est une compagnie de transport aérien créée en 1946 aux États Unis pour les besoins de la guerre civile en Chine. Célèbre pour sa proximité avec la CIA, elle a opéré principalement en Asie du Sud… …   Wikipédia en Français


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