Pore
Definition 1 of 2
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Visual Imagery
Picture small openings on surfaces to understand 'pore' as a noun. Microscopes reveal the pores in a leaf.
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Not Just Skin
'Pore' can refer to any tiny opening, not only on human skin. The porous rock had water streaming through its pores.
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Breathability
'Pore' conveys breathability in materials like fabric. The jacket's fabric has pores to allow sweat to evaporate.