Usually means: Tiny arachnid, often parasitic mite.
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We found 23 dictionaries that define the word acarus:

General (17 matching dictionaries)
  1. acarus: Merriam-Webster
  2. acarus: American Heritage Dictionary of the English Language
  3. acarus: Collins English Dictionary
  4. acarus: Vocabulary.com
  5. Acarus: Wordnik
  6. acarus: Wiktionary
  7. acarus: Infoplease Dictionary
  8. acarus: Dictionary.com
  9. Acarus: Wikipedia, the Free Encyclopedia
  10. Acarus: Online Plain Text English Dictionary
  11. acarus: Webster's Revised Unabridged, 1913 Edition
  12. acarus: Rhymezone
  13. Acarus: AllWords.com Multi-Lingual Dictionary
  14. acarus: FreeDictionary.org
  15. acarus: Mnemonic Dictionary
  16. acarus: TheFreeDictionary.com
  17. acarus: Merriam-Webster

Business (1 matching dictionary)
  1. acarus: Legal dictionary

Computing (1 matching dictionary)
  1. acarus: Encyclopedia

Medicine (4 matching dictionaries)
  1. acarus: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. Acarus: Medical dictionary

(Note: See acari as well.)

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Definitions from Wiktionary (acarus)

▸ noun:  (zoology, acarology) Any member of the subclass Acari (aka Acarina): thus, a mite or a tick; specifically, any mite of the genus Acarus.

Similar:
acarid, acarian, acarologist, mite, acaridean, acanthodrilid, acuariid, acanthosomatid, acanthoceratid, ascid, more...

Opposite:
acariasis, acarophobia, acaridophobia

Phrases:
acarus siro, genus acarus, acarus folliculorum, acarus scabiei, more...

Adjectives:
female, male, young, itch, perfect, same, minute, human, hairy, single, red

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Similar:
acarid, acarian, acarologist, mite, acaridean, acanthodrilid, acuariid, acanthosomatid, acanthoceratid, ascid, more...

Opposite:
acariasis, acarophobia, acaridophobia

Phrases:
acarus siro, genus acarus, acarus folliculorum, acarus scabiei, more...

Adjectives:
female, male, young, itch, perfect, same, minute, human, hairy, single, red



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