1) Animal order 2) Order acarina 
• (n. pl.) The group of Arachnida which includes the mites and ticks. Many species are parasitic, and cause diseases like the itch and mange.
subclass of the arthropod class Arachnida that includes the mite and tick (qq.v.).
(ak″ә-ri´nә) an order of arthropods (class Arachnoidea), including mites and ticks.
Ac`a·ri'na noun plural [ New Latin , from Greek ... a mite.] (Zoology) The group of Arachnida which includes the mites and ticks. Many species are parasitic, and cause diseases like the itch and mange. 
Type: Term Pronunciation: ak-ă-rī′nă Definitions: 1. An order of Arachnida that includes the mites and ticks.
Acarina is the mite and tick order of the Arachnida. They have a rounded body with no demarcation between the prosoma and the opisthosoma.
[n] - mites and ticks
Acarina, Acari The order of mites and ticks, in the class Arachnida; easily distinguished by a false head (gnathasoma) that has mouth parts, and by a lack of distinct separation between the cephalothorax and the abdomen. The Acarina is the most important order of the Arachnids, because in this group are found a number of pests of both plants and a...
Acari - a sub-class of Arachnids that are more commonly known as mites and ticks.
order Acarina noun mites and ticks