Usually means: Tool for identifying species systematically.
Definitions Related words Mentions
We found 8 dictionaries that define the word dichotomous key:

General (6 matching dictionaries)
  1. dichotomous key: Merriam-Webster
  2. dichotomous key: Collins English Dictionary
  3. dichotomous key: Wiktionary
  4. dichotomous key: Dictionary.com
  5. Dichotomous key: Wikipedia, the Free Encyclopedia
  6. dichotomous key: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. dichotomous key: Merriam-Webster Medical Dictionary

Science (1 matching dictionary)
  1. Botanical Terms (No longer online)

Definitions from Wiktionary (dichotomous key)

noun:  (biology) A written tool for identification of plants and animals. It is written as a sequence of paired questions, the choice of which determines the next pair of questions until a name or identification is reached.

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