Source : Webster's Revised Unabridged Dictionary (1913)

Capillary \Cap"il*la*ry\, n.; pl. {Capillaries}.
   1. A tube or vessel, extremely fine or minute.

   2. (Anat.) A minute, thin-walled vessel; particularly one of
      the smallest blood vessels connecting arteries and veins,
      but used also for the smallest lymphatic and biliary
      vessels.

Capillary \Cap"il*la*ry\ (k[a^]p"[i^]l*l[asl]*r[y^] or
   k[.a]*p[i^]l"l[.a]*r[y^]; 277), a. [L. capillaris, fr.
   capillus hair. Cf. {Capillaire}.]
   1. Resembling a hair; fine; minute; very slender; having
      minute tubes or interspaces; having very small bore; as,
      the capillary vessels of animals and plants.

   2. Pertaining to capillary tubes or vessels; as, capillary
      action.

   {Capillary attraction}, {Capillary repulsion}, the apparent
      attraction or repulsion between a solid and liquid caused
      by capillarity. See {Capillarity}, and {Attraction}.

   {Capillarity tubes}. See the {Note} under {Capillarity}.

Source : WordNet®

capillary
     adj 1: of or relating to hair
     2: long and slender with a very small internal diameter; "a
        capillary tube" [syn: {hairlike}]

capillary
     n 1: a tube of small internal diameter; holds liquid by capillary
          action [syn: {capillary tube}, {capillary tubing}]
     2: any of the minute blood vessels connecting arterioles with
        venules [syn: {capillary vessel}]