[1] : The Collaborative International Dictionary of English v.0.48

vascular \vas"cular\, a. l. vasculum a small vessel, dim. of
   vas vessel: cf. f. vasculaire. see vase, and cf. vessel.
   1913 webster
   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.
          1913 webster

   2. bot. of or pertaining to the higher division of plants,
      that is, the phaenogamous plants, all of which are
      vascular, in distinction from the cryptogams, which to a
      large extent are cellular only.
      1913 webster

   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, under 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 zool., 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.
      1913 webster
see also:
vase vascular plants cellular plants cellular vascular system vascular tissue 
water vascular system 

[2] : WordNet (r) 2.0

vascular system
     n : the vessels and tissue that carry or circulate fluids such
         as blood or lymph or sap through the body of an animal or
         plant

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