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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.
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Jewstone
::
Jewstone
(n.) A large
clavate
spine of a
fossil
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..
Piper
::
Piper (n.) A sea
urchin
(Goniocidaris
hystrix)
having
very long
spines,
native
of both the
American
and
European
coasts..
Echinoidea
::
Echinoidea
(n. pl.) The class
Echinodermata
which
includes
the sea
urchins.
They have a
calcareous,
usually
more or less
spheroidal
or
disk-shaped,
composed
of many
united
plates,
and
covered
with
movable
spines.
See
Spatangoid,
Clypeastroid..
Sea Urchin
::
Sea
urchin
() Any one of
numerous
species
of
echinoderms
of the order
Echinoidea.
Repkie
::
Repkie
(n.) Any
edible
sea
urchin.
Fasciole
::
Fasciole
(n.) A band of
minute
tubercles,
bearing
modified
spines,
on the
shells
of
spatangoid
sea
urchins.
See
Spatangoidea..
Petalosticha
::
Petalosticha
(n. pl.) An order of
Echini,
including
the
irregular
sea
urchins,
as the
spatangoids.
See
Spatangoid..
Coronal
::
Coronal
(a.) Of or
pertaining
to the shell of a sea
urchin.
Spatangus
::
Spatangus
(n.) A genus of
heart-shaped
sea
urchins
belonging
to the
Spatangoidea.
Sea Hedgehog
::
Sea
hedgehog
() A sea
urchin.
Auricula
::
Auricula
(n.) One of the five
arched
processes
of the shell
around
the jaws of a sea
urchin.
Regular
::
Regular
(a.)
Having
all the parts of the same kind alike in size and
shape;
as, a
regular
flower;
a
regular
sea
urchin..
Lithophagous
::
Lithophagous
(a.)
Eating
or
destroying
stone;
--
applied
to
various
animals
which make
burrows
in
stone,
as many
bivalve
mollusks,
certain
sponges,
annelids,
and sea
urchins.
See
Lithodomus..
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..
Rosette
::
Rosette
(n.) Any
structure
having
a
flowerlike
form;
especially,
the group of five broad
ambulacra
on the upper side of the
spatangoid
and
clypeastroid
sea
urchins.
See
Illust.
of
Spicule,
and Sand
dollar,
under
Sand..
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.
Regularia
::
Regularia
(n. pl.) A
division
of
Echini
which
includes
the
circular,
or
regular,
sea
urchins..
Sea Egg
::
Sea egg () A sea
urchin.
Scrobicula
::
Scrobicula
(n.) One of the
smooth
areas
surrounding
the
tubercles
of a sea
urchin.
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