Source : Webster's Revised Unabridged Dictionary (1913)

Vesiculate \Ve*sic"u*late\, a.
   Bladdery; full of, or covered with, bladders; vesicular.

Vesiculate \Ve*sic"u*late\, v. t.
   To form vesicles in, as lava.

Source : WordNet®

vesiculate
     v 1: become vesicular or full of air cells; "The organs
          vesiculated"
     2: cause to become vesicular or full of air cells; "vesiculate
        an organ"