n. a bloodsucking parasite belonging to the order of arthropods (the Acarina) that also includes the mites. Tick bites can cause serious skin lesions and occasionally paralysis (see Ixodes, Amblyomma), and certain tick species transmit typhus, Lyme disease, and relapsing fever. Diethyltoluamide (DEET) is used as a tick repellent. There are two families: Argasidae (soft ticks), which includes Ornithodoros, with mouthparts invisible from above and no hard shield (scutum) on the dorsal surface; and Ixodidae (hard ticks), including Dermacentor, Haemaphysalis, and Rhipicephalus, with clearly visible mouthparts and a definite scutum.
Subjects: Medicine and Health.