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Definition of sea urchin
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of sea urchin is as below...
Sea
urchin
() Any one of
numerous
species
of
echinoderms
of the order
Echinoidea.
Lern More About Sea Urchin
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Petalosticha
::
Petalosticha
(n. pl.) An order of
Echini,
including
the
irregular
sea
urchins,
as the
spatangoids.
See
Spatangoid..
Regularia
::
Regularia
(n. pl.) A
division
of
Echini
which
includes
the
circular,
or
regular,
sea
urchins..
Sea Egg
::
Sea egg () A sea
urchin.
Echinus
::
Echinus
(n.) A name
sometimes
given to the egg and
anchor
or egg and dart
molding,
because
that
ornament
is often
identified
with Roman Doric
capital.
The name
probably
alludes
to the shape of the shell of the sea
urchin..
Semita
::
Semita
(n.) A
fasciole
of a
spatangoid
sea
urchin.
Pluteus
::
Pluteus
(n.) The
free-swimming
larva of sea
urchins
and
ophiurans,
having
several
long stiff
processes
inclosing
calcareous
rods..
Paleechinoidea
::
Paleechinoidea
(n. pl.) An
extinct
order of sea
urchins
found in the
Paleozoic
rocks.
They had more than
twenty
vertical
rows of
plates.
Called
also
Palaeechini.
Echinus
::
Echinus
(n.) A genus of
echinoderms,
including
the
common
edible
sea
urchin
of
Europe..
Repkie
::
Repkie
(n.) Any
edible
sea
urchin.
Micraster
::
Micraster
(n.) A genus of sea
urchins,
similar
to
Spatangus,
abounding
in the chalk
formation;
-- from the
starlike
disposal
of the
ambulacral
furrows..
Clypeastroid
::
Clypeastroid
(a.) Like or
related
to the genus
Clupeaster;
--
applied
to a group of
flattened
sea
urchins,
with a
rosette
of pores on the upper
side..
Siphon
::
Siphon
(n.) A
tubular
organ
connected
both with the
esophagus
and the
intestine
of
certain
sea
urchins
and
annelids.
Jewstone
::
Jewstone
(n.) A large
clavate
spine of a
fossil
sea
urchin.
Spatangus
::
Spatangus
(n.) A genus of
heart-shaped
sea
urchins
belonging
to the
Spatangoidea.
Spatangoidea
::
Spatangoidea
(n. pl.) An order of
irregular
sea
urchins,
usually
having
a more or less
heart-shaped
shell with four or five
petal-like
ambulacra
above.
The mouth is
edentulous
and
situated
anteriorly,
on the under
side..
Scrobicula
::
Scrobicula
(n.) One of the
smooth
areas
surrounding
the
tubercles
of a sea
urchin.
Tangle
::
Tangle
(v.) An
instrument
consisting
essentially
of an iron bar to which are
attached
swabs,
or
bundles
of
frayed
rope, or other
similar
substances,
-- used to
capture
starfishes,
sea
urchins,
and other
similar
creatures
living
at the
bottom
of the sea..
Sphaeridium
::
Sphaeridium
(n.) A
peculiar
sense organ found upon the
exterior
of most kinds of sea
urchins,
and
consisting
of an oval or
sherical
head
surmounting
a short
pedicel.
It is
generally
supposed
to be an
olfactory
organ..
Aristotle's Lantern
::
Aristotle's
lantern
() The five
united
jaws and
accessory
ossicles
of
certain
sea
urchins.
Piper
::
Piper (n.) A sea
urchin
(Goniocidaris
hystrix)
having
very long
spines,
native
of both the
American
and
European
coasts..
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