Source : Webster's Revised Unabridged Dictionary (1913)

Vascular \Vas"cu*lar\, a. [L. vasculum a small vessel, dim. of
   vas vessel: cf. F. vasculaire. See {Vase}, and cf. Vessel.]
   1. (Biol.)
      (a) Consisting of, or containing, vessels as an essential
          part of a structure; full of vessels; specifically
          (Bot.), pertaining to, or containing, special ducts,
          or tubes, for the circulation of sap.
      (b) Operating by means of, or made up of an arrangement
          of, vessels; as, the vascular system in animals,
          including the arteries, veins, capillaries, lacteals,
          etc.
      (c) Of or pertaining to the vessels of animal and
          vegetable bodies; as, the vascular functions.

   2. (Bot.) Of or pertaining to the higher division of plants,
      that is, the ph[ae]nogamous plants, all of which are
      vascular, in distinction from the cryptogams, which to a
      large extent are cellular only.

   {Vascular plants} (Bot.), plants composed in part of vascular
      tissue, as all flowering plants and the higher
      cryptogamous plants, or those of the class {Pteridophyta}.
      Cf. {Cellular plants}, {Cellular}.

   {Vascular system} (Bot.), the body of associated ducts and
      woody fiber; the fibrovascular part of plants.

   {Vascular tissue} (Bot.), vegetable tissue composed partly of
      ducts, or sap tubes.

   {Water vascular system} (Zo["o]l.), a system of vessels in
      annelids, nemerteans, and many other invertebrates,
      containing a circulating fluid analogous to blood, but not
      of the same composition. In annelids the fluid which they
      contain is usually red, but in some it is green, in others
      yellow, or whitish.

Source : WordNet®

vascular tissue
     n : tissue that conducts water and nutrients through the plant
         body in higher plants