The phrase "tiny pores" means very small openings or holes.
Sentences with «tiny pores»
And they open tiny pores in their leaves to allow carbon dioxide in for photosynthesis. (scientificamerican.com)
The fluids react with relatively acidic seawater to produce mineral structures full of tiny pores, where hydrogen and carbon dioxide come together to form simple molecules. (newscientist.com)
Like a type of door, sodium channels allow sodium ions to flow into nerve cells through tiny pores. (sciencedaily.com)