#spiracle  a breathing orifice
  supertype:  #orifice__opening__porta  an aperture or hole opening into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"
  subtype:  #blowhole  the spiracle of a cetacean located far back on the skull
  subtype:  #stigma.spiracle  an external tracheal aperture in a terrestrial arthropod

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