Webster's English Dictionary

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tenacious

Cross references:
  1. strong                
 
te.na.cious \t*-'na--sh*s\ aj [L tenac-, tenax tending to hold fast, fr. 
   tene-re to hold] 1a: not easily pulled apart : COHESIVE, TOUGH {a ~ m etal} 
   1b: tending to adhere to another substance : STICKY {~ bur s} 2a: holding 
   fast or tending to hold fast : PERSISTENT, STUBBORN  {~ of his rights} 2b: 
   RETENTIVE {a ~ memory}  - te.na.cious.ly av