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capillary (adj) (of a small tube) having a bore (hole) as thin as hair.
A small tube with a very narrow bore is a capillary tube. Capillary action is the force that sends a liquid up a narrow bore. So, having a narrow bore is capillary.
- The doctor is making a special study of the process by which blood moves up the small, narrow blood vessels by means of capillary action.
- The thrust required to push a liquid up a capillary tube depends on the diameter or the radius of the bore.