Pore (noun)

1. A small opening in a surface, such as the skin, through which liquids or gases can pass.
2. A small opening in a rock or other material through which fluids can pass.
3. A small opening in a leaf or stem through which gases can enter or leave.

Origin:

From old english por, from proto-germanic *puraz meaning "a small opening", from proto-indo-european *pur-, *pur- "passage, opening".

Examples:

1. The skin has millions of tiny pores that release oils and sweat.
2. The rock had many small pores that allowed water to seep through.
3. The leaves had small pores called stomata that allowed the plant to exchange gases with the air.
4. The mask was designed to unclog the pores and make the skin look smoother.
5. The water was able to permeate the soil through the tiny pores.