The Collaborative International Dictionary of English v.0.48:

Dowle \Dowle\, n. [Cf. OF. douille soft. Cf. Ductile.]
   Feathery or wool-like down; filament of a feather. --Shak.
   [1913 Webster]

         No feather, or dowle of a feather.       --De Quincey.
   [1913 Webster]