Nouns

(n)capillary, capillary tube, capillary tubinga tube of small internal diameter; holds liquid by capillary action
(n)capillary, capillary vesselany of the minute blood vessels connecting arterioles with venules

Adjectives

(a)capillaryof or relating to hair
(s)capillary, hairlikelong and slender with a very small internal diameter“a capillary tube”