1. 
   Impennes
   Im·pen'nes noun plural [ New Latin , from Latin prefix im- not + penna feather.] (Zoology) An order of birds, including only the penguins, in which the wings are without quills, and not suited for flight.
   Found op http://www.encyclo.co.uk/webster/I/18
   
   
2. 
   impennes
   <ornithology> An order of birds, including only the penguins, in which the wings are without quills, and not suited for flight. ... Origin: NL, fr. L. Pref. Im- not + penna feather. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?impennes
   
   
3. 
   Impennes
   • (n. pl.) An order of birds, including only the penguins, in which the wings are without quills, and not suited for flight.
   Found op http://thinkexist.com/dictionary/meaning/impennes/
   
   
4. 
   Impennes
   Impennes is a name given to swimming birds which have only rudimentary feathers, such as penguins.
   Found op http://www.probertencyclopaedia.com/browse/BI.HTM
   
   

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