ac·​a·​rid ˈa-kə-rəd How to pronounce acarid (audio)
: any of an order (Acari synonym Acarina) of arachnids including the mites and ticks
acarid adjective

Word History


acar(us) + -id entry 1, probably after the New Latin order name Acarida or the family name Acaridae

First Known Use

1861, in the meaning defined above

Time Traveler
The first known use of acarid was in 1861

Dictionary Entries Near acarid

Cite this Entry

“Acarid.” Dictionary, Merriam-Webster, Accessed 12 Apr. 2024.

Medical Definition


ac·​a·​rid ˈak-ə-rəd How to pronounce acarid (audio)
: any of the order Acari of arachnids
especially : any of the family Acaridae of mites
acarid adjective
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