▪ I.acaroid,a.Zool.|ˈækərɔɪd| [f.mod.L. Acar-us + -oid.] Having the form of, or allied to, an Acarus or mite; mite-like. 1880F. W. Burbidge Gard. of Sun xiv. 293 My skin..was covered with irritable red eruptions, caused by a minute red parasite of acaroid nature. ▪ II.acaroid see accaroid.