Source : Webster's Revised Unabridged Dictionary (1913)

Sardan \Sar"dan\, Sardel \Sar"del\, n. [It. sardella. See
   {Sardine} a fish.] (Zo["o]l.)
   A sardine. [Obs.]

Sardel \Sar"del\, n.
   A precious stone. See {Sardius}.