dichotomous

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di·chot·o·mous

(dī-kot'ō-mŭs),
Denoting or characterized by dichotomy.
Synonym(s): dichotic (1)

dichotomous

  1. (of a plant, such as many algal species) branching by repeated division into two equal parts.
  2. (of characters) choosing between two possibilities. See KEY, IDENTIFICATION.