noun: any small opening in the skin or outer surface of an animal
noun: any tiny hole admitting passage of a liquid (fluid or gas)
noun: a minute epidermal pore in a leaf or stem through which gases and water vapor can pass

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Schauberger
When the Earth approaches the Sun in winter the intensity of light increases, because in this case the resisting power of the Earth's almost hermetically sealed pores (nozzles) becomes greater. If this natural reciprocity is copied naturalesquely, then the production of power, light, heat and cold will be virtually free. On the other hand, germinating- and growth-energies will continuously and progressively rise to about an average of 30% per annum, which roughly corresponds to the normal increase in the human population. [The Energy Evolution - Harnessing Free Energy from Nature, Bio-Technology: Active and Reactive Temperatures]