capillary
ca-pil-la-ry
noun
A minute blood vessel connecting arterioles and venules, facilitating substance exchange.
"Oxygen passes from capillaries into body tissues."
adjective
Relating to capillaries; having a very fine, hair-like bore or tube.
"Observe the capillary action in the narrow tube."
Thesaurus
Synonyms: hairlike, thin, capillary vessel, capillary tubing, capillary tube