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Pore

From Biology-Online Dictionary
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pore

1. One of the minute orifices in an animal or vegetable membrane, for transpiration, absorption, etc.

2. A minute opening or passageway; an interstice between the constituent particles or molecules of a body; as, the pores of stones.

Origin: F, fr. L. Porus, Gr. A passage, a pore. See Fare.