We found 28 dictionaries that define the word hyperactivity:

General (14 matching dictionaries)

1. hyperactivity: Merriam-Webster
2. hyperactivity: Oxford Learner's Dictionaries
3. hyperactivity: Collins English Dictionary
4. hyperactivity: Vocabulary.com
5. Hyperactivity, hyperactivity: Wordnik
6. hyperactivity: Cambridge Advanced Learner's Dictionary
7. hyperactivity: Wiktionary
8. hyperactivity: Infoplease Dictionary
9. hyperactivity: Dictionary.com
10. Hyperactivity: Wikipedia, the Free Encyclopedia
11. hyperactivity: FreeDictionary.org
12. hyperactivity: Mnemonic Dictionary
13. hyperactivity: TheFreeDictionary.com
14. hyperactivity: Rhymezone

Computing (1 matching dictionary)

15. hyperactivity: Encyclopedia

Medicine (11 matching dictionaries)

16. hyperactivity: Merriam-Webster Medical Dictionary
17. Dorland's Illustrated Medical Dictionary (No longer online)
18. Hyperactivity: MedTerms.com Medical Dictionary
19. online medical dictionary (No longer online)
20. Hyperactivity: MEDLINE plus Illustrated Medical Encyclopedia
21. hyperactivity: Dictionary of Cancer Terms
22. A-Z Family health glossary (No longer online)
23. Sleep Terms (No longer online)
24. hyperactivity: Medical dictionary
25. University of Maryland Glossary of Medical Terms (No longer online)
26. Hyperactivity: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)

27. A Brief Critical Dictionary of Education (No longer online)

Slang (1 matching dictionary)

28. hyperactivity: Urban Dictionary

Definitions from Wiktionary (hyperactivity) ▸ noun:  The quality of being hyperactive; excessive and pathological movement and restlessness. Similar: hyperactiveness, hyperdynamicity, hyperfunctionality, hyperirritability, hecticity, hectivity, hyperfluency, hyperresponsivity, hyperaggressiveness, hyperemotivity, more... Opposite: hypoactivity, lethargy, sluggishness, inactivity Types: narcolepsy, more... Phrases: hyperactivity disorder, attention deficit hyperactivity disorder, attention-deficit hyperactivity disorder, rumenoreticular hyperactivity, hyperactivity and children, more... Adjectives: autonomic, sympathetic, induced, adrenal, deficit, extreme, nervous, muscular, neuronal, cell, adrenocortical Colors:     neon green,     electric blue,     hot pink,     bright yellow,     lime green, more... ▸ Words similar to hyperactivity ▸ Usage examples for hyperactivity ▸ Idioms related to hyperactivity ▸ Wikipedia articles (New!) ▸ Popular adjectives describing hyperactivity ▸ Words that often appear near hyperactivity ▸ Rhymes of hyperactivity ▸ Invented words related to hyperactivity