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tick2

Syllabification: (tick)

Pronunciation: /tik/

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Definition of tick

noun

a parasitic arachnid that attaches itself to the skin of a terrestrial vertebrate from which it sucks blood, leaving the host when sated. Some species transmit diseases, including tularemia and Lyme disease.
- Suborder Ixodida, order Acarina (or Acari)
informal a parasitic louse fly.