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plural of .
a mite, especially of the genus Acarus.
Historical Examples

acari of all sizes—that is, in all stages of growth—may be met with in most samples of sugar.
Cooley’s Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades…, Sixth Edition, Volume I Arnold Cooley

The itchiness disappears almost immediately and the acari are speedily destroyed.
Cooley’s Practical Receipts, Volume II Arnold Cooley

For mites (acari) sulphur is the essential ingredient of a spray.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 Various

acari in the eye have been incidentally alluded to under inflammation of the lids.
Special Report on Diseases of the Horse United States Department of Agriculture

It is among the smallest of the acari, and is sometimes not distinguishable without a microscope.
Mrs. Hale’s Receipts for the Million Sarah Josepha Hale

acari and Psocidæ attack dried fungi of all kinds, and speedily reduce them to an unrecognizable powder.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

The parasitical animals that infest the human body are referred to under the heads acari and Pediculi.
Cooley’s Practical Receipts, Volume II Arnold Cooley

We selected six healthy sheep, which we kept well supplied with provisions; we covered these healthy sheep with parasites (acari).
On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment Honor Bourguignon

Beziehungen des Helminthen und acari zur Geschwulsttiologie.
Handbook of Medical Entomology William Albert Riley

Who is there that does not nourish some acari, of the genus Simonea, in the membrane of the nose?
Animal Parasites and Messmates P. J. Van Beneden

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

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