Source : Webster's Revised Unabridged Dictionary (1913)

Ditrichotomous \Di`tri*chot"o*mous\, a. [Pref. di- +
   trichotomous.]
   1. Divided into twos or threes.

   2. (Bot.) Dividing into double or treble ramifications; --
      said of a leaf or stem. [R.] --Loudon.