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Also poros‑

A pore.

Latin porus, pore.

Porencephaly (Greek enkephalos, brain) is an abnormal communication between the lateral ventricle and the surface of the brain; porokeratosis (Greek keras, kerat‑, horn) is a skin disease in which lesions develop as annular horny ridges; porosimetry is the measurement of the size of pores in materials; a porometer is an instrument for estimating the sizes of the stomata of leaves by measuring the rate at which air can be passed through them.

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