[1] : The Collaborative International Dictionary of English v.0.48

pennon \pen"non\, n. cf. pinion.
   a wing; a pinion. --milton.
   1913 webster
see also:
pinion 

[2] : The Collaborative International Dictionary of English v.0.48

pennon \pen"non\, n. see pennant.
   a pennant; a flag or streamer. --longfellow.
   1913 webster pennoncel
see also:
pennant 

[3] : WordNet (r) 2.0

pennon
     n 1: a long flag; often tapering syn: pennant, streamer, waft
     2: wing of a bird syn: pinion
see also:
pennant streamer waft pinion 

Pennon >> P Words
Pennon, definition of term: Pennon
pennon_pag1.html