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[ak-er-uh s] /ˈæk ər əs/
noun, plural acari
[ak-uh-rahy] /ˈæk əˌraɪ/ (Show IPA)
a mite, especially of the genus Acarus.
Origin of acarus
1650-60; < New Latin < Greek ákari mite Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for acarus


noun (pl) -ri (-ˌraɪ)
any of the free-living mites of the widely distributed genus Acarus, several of which, esp A. siro, are serious pests of stored flour, grain, etc
Word Origin
C17: New Latin, from Greek akari a small thing, a mite
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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acarus in Medicine

Acarus Ac·a·rus (āk'ə-rəs)
A genus of mites.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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