The Collaborative International Dictionary of English v.0.48:

Seannachie \Sean"na*chie\, n. [Gael. seanachaidh.]
   A bard among the Highlanders of Scotland, who preserved and
   repeated the traditions of the tribes; also, a genealogist.
   [Written also sennachy.] [Scot.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sennachy \Sen"na*chy\, n.
   See Seannachie.
   [1913 Webster]