Definition of blue tick in English:

blue tick

noun

  • Any of several cattle ticks of the genus Rhipicephalus and subgenus Boophilus (family Ixodidae); specifically R. decoloratus, which is found mainly in sub-Saharan Africa and transmits babesiosis (redwater), anaplasmosis, and other parasitic diseases in wild and domesticated mammals.

Origin

Mid 19th century; earliest use found in Journal Royal Asiatic Society. From blue + tick, so called because of the blue appearance of the body of the engorged female.

Pronunciation

blue tick

/ˌbluː ˈtɪk/