['hauzn, 'hɔ:zn]
n.
[鱼](黑海、里海及其河流等处产的)大白鲟

[ noun ]
valuable source of caviar and isinglass; found in Black and Caspian seas
<noun.animal>

Hausen \Hau"sen\ (h[add]"s[e^]n), n. [G.] (Zo["o]l.)
A large sturgeon ({Acipenser huso} syn. {Huso huso}) from the
region of the Black Sea; also called {Beluga}. It is
sometimes twelve feet long, and provides the highest quality
{caviar}.
[1913 Webster +PJC]

Huso \Hu"so\, n. [NL., fr. G. hausen, and E. isinglass.]
(Zo["o]l.)
(a) A large European sturgeon ({Huso huso} or {Acipenser
huso}), inhabiting the region of the Black and Caspian
Seas. It sometimes attains a length of more than
twelve feet, and a weight of two thousand pounds.
Called also {hausen} and {beluga}. It is the source of
the finest and most esteemed caviar.
(b) The huchen, a large salmon.


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. (Zo["o]l.) 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}.
[PJC]

3. the caviar obtained from the beluga[2]; -- 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
{caviar}.
[PJC]