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capillary (C1)

noun

Pronunciation: /kəˈpɪləri/

A tiny, narrow tube that forms part of the system of blood vessels in the body, or a similar small tube used in scientific equipment.

The doctor explained how the blood flows from arteries to capillaries and then to veins.
A microscope is needed to see the capillaries in the frog's webbed foot.
The plant's roots absorb water through tiny root hairs and capillaries.