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pore



  1. (BIOLOGY) Any opening into or through a tissue or body structure.

       • ANATOMY AND PHYSIOLOGY


  2. (ASTRONOMY) A short-lived dark spot in the Sun's photosphere resembling a small sunspot without a penumbra. Pores last less than an hour and range up to 2,500 km in diameter. They occasionally form where several granulation channels meet and sometimes precede the development of sunspots.

       • SOLAR TOPICS