1. roe of beluga sturgeon usually from Russia; highly valued;
The Collaborative International Dictionary of English v.0.48:
Beluga \Be*lu"ga\ (b[-e]*l[=u]"g[.a]), n. [Russ. bieluga a sort
of large sturgeon, prop. white fish, fr. bieluii white. The
whale is now commonly called bieluka in Russian.]
1. (Zool.) A cetacean allied to the dolphins.
Note: The northern beluga (Delphinapterus catodon) is the
white whale and white fish of the whalers. It grows
to be from twelve to eighteen feet long.
2. the sturgeon (Huso huso) native to the Black Sea and
Caspian Sea; -- also called hausen. It is valued for its
roe, sold as caviar, and is also used for production of
isinglass. See also sturgeon.
3. the caviar obtained from the beluga; -- also called
beluga caviar. The caviar of the beluga is considered
the finest sort, larger and of a taste superior to that
obtained from other sturgeon. See also sturgeon and
WordNet (r) 3.0 (2006):
n 1: roe of beluga sturgeon usually from Russia; highly valued