Webster's English Dictionary

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vesicular

ve.sic.u.lar \v*-'sik-y*-l*r, ve-\ aj [NL vesicula vesicle, fr. L, small 
   bladder] 1: of or relating to vesicles and esp. to the alveoli of the lungs 
    2: having the form of structure of a vesicle  3: containing, composed of, 
   or characterized by vesicles : VESICULATE  - ve.sic.u.lar.ly av