noun. ticks having a hard shield on the back and mouth parts that project from the head.
1. Noun, singular or mass The brown dog tick (Rhipicephalus sanguineus), an ixodid, is found in Arizona and throughout the United States. 2. Adjective The Dermacentor andersoni, or Rocky Mountain wood tick, is an ixodid found in the arid brushy areas of northern Arizona.