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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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Sea Egg
::
Sea egg () A 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..
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..
Regular
::
Regular
(a.)
Having
all the parts of the same kind alike in size and
shape;
as, a
regular
flower;
a
regular
sea
urchin..
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.
Galerite
::
Galerite
(n.) A
cretaceous
fossil
sea
urchin
of the genus
Galerites.
Corona
::
Corona
(n.) The
shelly
skeleton
of a sea
urchin.
Turban-shell
::
Turban-shell
(n.) A sea
urchin
when
deprived
of its
spines;
--
popularly
so
called
from a
fancied
resemblance
to a
turban.
Coronal
::
Coronal
(a.) Of or
pertaining
to the shell 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..
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.
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..
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..
Urchin
::
Urchin
(n.) A sea
urchin.
See Sea
urchin.
Repkie
::
Repkie
(n.) Any
edible
sea
urchin.
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..
Aristotle's Lantern
::
Aristotle's
lantern
() The five
united
jaws and
accessory
ossicles
of
certain
sea
urchins.
Echinus
::
Echinus
(n.) A genus of
echinoderms,
including
the
common
edible
sea
urchin
of
Europe..
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