Slender, hairlike, having a very small diameter. Small diameter, thin-walled vessel which forms part of a network and allows the quick exchange of substances between contained fluid and surrounding tissues as in the bile, blood, or lymph capillaries.

CAPILLARY: "The capillary system is very extensive."

Link to This Definition

Did you find this definition of CAPILLARY helpful? You can share it by copying the code below and adding it to your blog or web page.
Edited and fact checked by Pam: Google +