The Collaborative International Dictionary of English v.0.48:

Caviar \Cav"i*ar\, Caviare \Ca*viare"\, n. [F. caviar, fr. It.
   caviale, fr. Turk. Hav[imac][=a]r.]
   The roes of the sturgeon, prepared and salted; -- used as a
   relish, esp. in Russia.
   [1913 Webster]

   Note: Caviare was considered a delicacy, by some, in
         Shakespeare's time, but was not relished by most. Hence
         Hamlet says of a certain play. "'T was caviare to the
         general," i. e., above the taste of the common people.
         [1913 Webster]

WordNet (r) 3.0 (2006):

caviare
    n 1: salted roe of sturgeon or other large fish; usually served
         as an hors d'oeuvre [syn: caviar, caviare]