Source : Webster's Revised Unabridged Dictionary (1913)

Vesicular \Ve*sic"u*lar\, a. [Cf. F. v['e]siculaire.]
   1. Of or pertaining to vesicles; esp., of or pertaining to
      the air vesicles, or air cells, of the lungs; as,
      vesicular breathing, or normal breathing, in which the air
      enters freely the air vesicles of the lungs.

   2. Containing, or composed of, vesicles or vesiclelike
      structures; covered with vesicles or bladders; vesiculate;
      as, vesicular coral; vesicular lava; a vesicular leaf.

   3. Having the form or structure of a vesicle; as, a vesicular
      body.

   {Vesicular column} (Anat.), a series of nerve cells forming
      one of the tracts distinguished in the spinal; -- also
      called the {ganglionic column}.

   {Vesicular emphysema} (Med.), emphysema of the lungs, in
      which the air vesicles are distended and their walls
      ruptured.

   {Vesicular murmur} (Med.), the sound, audible on auscultation
      of the chest, made by the air entering and leaving the air
      vesicles of the lungs in respiration.

Source : WordNet®

vesicular
     adj : of or relating to or involving vesicles; "normal vesicular
           breathing"