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te·na·cious tə-'nā-shəs adj tending to adhere or cling esp. to another substance: VISCOUS <coughed up 150 cc. of thick \tenacious sputum (Jour. Amer. Med. Assoc.)>
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te·na·cious (tə-naґshəs) [L. tenax] holding fast; adhesive.Medical dictionary. 2011.