The Collaborative International Dictionary
Acaridan
Acaridan \A*car"i*dan\, n. [See Acarus.] (Zo["o]l.) One of a group of arachnids, including the mites and ticks. [1913 Webster] ||
Wiktionary
acaridan
n. (context zoology English) A member of the sub-class Acarina of arachnids, which includes mites and ticks.