We found 10 dictionaries that define the word by the head:

General (6 matching dictionaries)

1. by the head: Merriam-Webster
2. by the head: Oxford Learner's Dictionaries
3. by the head: Wordnik
4. By the head: Dictionary.com
5. by the head: FreeDictionary.org
6. By the head: TheFreeDictionary.com

Business (1 matching dictionary)

7. by the head: Merriam-Webster Legal Dictionary

Computing (1 matching dictionary)

8. by the head: Encyclopedia

Medicine (1 matching dictionary)

9. by the head: Merriam-Webster Medical Dictionary

Tech (1 matching dictionary)

10. SeaTalk Dictionary of English Nautical Language (No longer online)

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