Source : Webster's Revised Unabridged Dictionary (1913)

Cincinnus \Cin*cin"nus\, n.; pl. {-ni}. [Also {cicinus},
   {cicinnus}.] [L., a curl of hair.] (Bot.)
   A form of monochasium in which the lateral branches arise
   alternately on opposite sides of the false axis; -- called
   also {scorpioid cyme}. -- {Cin*cin"nal}, a.

Source : WordNet®

scorpioid cyme
     n : a cyme with flowers or branches alternating in opposite
         ranks