Webster's English Dictionary

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verticillate

ver.ti.cil.late \.v*rt-*-'sil-*t\ \.v*rt-*-.sil-'a--sh*n\ aj : arranged in 
   verticils : WHORLED; esp : arranged in a tr ansverse whorl like the spokes 
   of a wheel {~ leaves a ~ shell} - ver.ti.cil.late.ly av