tigri-, tigr-, tiger (Greek > Latin > Old French: swift animal).Related to "arrow" and "pointed" thus probably describing a tiger as "swift as an arrow"; said to be a word of Iranian origin.tiger: 
1. A large carnivorous feline mammal, having a tawny coat with transverse black stripes.  
2. Panthera tigris, of Asia; ranging in several races from India and the Malay Peninsula to Siberia: the entire species is endangered, with some races thought to be extinct; any of a variety of other similar felines. 3. A fierce, aggressive, or audacious person. tigress: 
1. A female tiger.  
2. A fierce, aggressive, or audacious woman. 3. A woman resembling a tiger, as in fierceness or courage. tigrish, tigerish: 
1. Tigerlike, as in strength, fierceness, courage, or coloration.  
2. Fiercely cruel; bloodthirsty, relentless. Tigris River: 
Literally "the swift river"; a river, 1150 miles (1850 km) long, in SW Asia, flowing South East from SE Turkey through Iraq, joining the Euphrates River; to form by their confluence, the Shatt-al-Arab River (or Shatt al Arab) c. 120 miles (193 km) in SE Iraq.
 
tigroid: 
Resembling a tiger or tiger's skin; marked like a tiger; having the characteristics of a tiger (fierce, aggressive, etc.).
 
tigrology: 
A branch of zoology that specializes in the study of tigers.
 
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