Webster's English Dictionary

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yaws

yaws \'yo.z\ \fram-'be--zh(e--)*\ n [of Cariban origin; akin to Calinago 
   ya`ya yaws] pl but sing or pl in constr  : an infectious contagious 
   tropical disease caused by a spirochete (Tre ponema pertenue) and marked by 
   ulcerating lesions with later bone involvement