siphuncle
腹管
腹管
Siphon \
Si "
phon \,
n . [
F .
siphon ,
L .
sipho , -
onis ,
fr .
Gr . ???
a siphon ,
tube ,
pipe .]
1 .
A device ,
consisting of a pipe or tube bent so as to form two branches or legs of unequal length ,
by which a liquid can be transferred to a lower level ,
as from one vessel to another ,
over an intermediate elevation ,
by the action of the pressure of the atmosphere in forcing the liquid up the shorter branch of the pipe immersed in it ,
while the continued excess of weight of the liquid in the longer branch (
when once filled )
causes a continuous flow .
The flow takes place only when the discharging extremity of the pipe ia lower than the higher liquid surface ,
and when no part of the pipe is higher above the surface than the same liquid will rise by atmospheric pressure ;
that is ,
about 33 feet for water ,
and 30 inches for mercury ,
near the sea level .
[
1913 Webster ]
2 . (
Zool .)
(
a )
One of the tubes or folds of the mantle border of a bivalve or gastropod mollusk by which water is conducted into the gill cavity .
See Illust .
under {
Mya },
and {
Lamellibranchiata }.
(
b )
The anterior prolongation of the margin of any gastropod shell for the protection of the soft siphon .
(
c )
The tubular organ through which water is ejected from the gill cavity of a cephaloid .
It serves as a locomotive organ ,
by guiding and confining the jet of water .
Called also {
siphuncle }.
See Illust .
under {
Loligo },
and {
Dibranchiata }.
(
d )
The siphuncle of a cephalopod shell .
(
e )
The sucking proboscis of certain parasitic insects and crustaceans .
(
f )
A sproutlike prolongation in front of the mouth of many gephyreans .
(
g )
A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids .
[
1913 Webster ]
3 .
A siphon bottle .
[
1913 Webster ]
{
Inverted siphon },
a tube bent like a siphon ,
but having the branches turned upward ;
specifically (
Hydraulic Engineering ),
a pipe for conducting water beneath a depressed place ,
as from one hill to another across an intervening valley ,
following the depression of the ground .
{
Siphon barometer }.
See under {
Barometer }.
{
Siphon bottle },
a bottle for holding aerated water ,
which is driven out through a bent tube in the neck by the gas within the bottle when a valve in the tube is opened ; --
called also {
gazogene },
and {
siphoid }.
{
Siphon condenser },
a condenser for a steam engine ,
in which the vacuum is maintained by the downward flow of water through a vertical pipe of great height .
{
Siphon cup },
a cup with a siphon attached for carrying off any liquid in it ;
specifically (
Mach .),
an oil cup in which oil is carried over the edge of a tube in a cotton wick ,
and so reaches the surface to be lubricated .
{
Siphon gauge }.
See under {
Gauge }.
{
Siphon pump },
a jet pump .
See under {
Jet },
n .
[
1913 Webster ]
Siphuncle \
Si "
phun `
cle \,
n . [
L .
siphunculus ,
sipunculus ,
dim .
of sipho .
See {
Siphon }.] (
Zool .)
The tube which runs through the partitions of chambered cephalopod shells .
[
1913 Webster ]
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