a. [ Pref. di- + trichotomous. ] 1. Divided into twos or threes. [ 1913 Webster ]

2. (Bot.) Dividing into double or treble ramifications; -- said of a leaf or stem. [ R. ] Loudon. [ 1913 Webster ]

a. [ See Trichotomy. ] Divided into three parts, or into threes; three-forked; as, a trichotomous stem. Martyn. [ 1913 Webster ]