The Collaborative International Dictionary of English v.0.48:

Acadian \A*ca"di*an\, a.
   Of or pertaining to Acadia, or Nova Scotia. "Acadian
   farmers." --Longfellow. -- n. A native of Acadie.
   [1913 Webster]

   Acadian epoch (Geol.), an epoch at the beginning of the
      American paleozoic time, and including the oldest American
      rocks known to be fossiliferous. See Geology.

   Acadian owl (Zool.), a small North American owl (Nyctule
      Acadica); the saw-whet.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Saw-whet \Saw"-whet`\, n. (Zool.)
   A small North American owl (Nyctale Acadica), destitute of
   ear tufts and having feathered toes; -- called also Acadian
   owl.
   [1913 Webster]