Source : Webster's Revised Unabridged Dictionary (1913)

Verticillate \Ver*tic"il*late\ (?; 277), Verticillated
\Ver*tic"il*la`ted\, a. [See {Verticil}.] (Bot. & Zo["o]l.)
   Arranged in a transverse whorl or whorls like the rays of a
   wheel; as, verticillate leaves of a plant; a verticillate
   shell.

Source : WordNet®

verticillate
     adj : forming one or more whorls (especially a whorl of leaves
           around a stem) [syn: {verticillated}, {whorled}]