Last Updated：2025/11/20
A shelly concretion, usually rounded, and having a brilliant luster, with varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves. It is usually due to a secretion of shelly substance around some irritating foreign particle. Its substance is the same as nacre, or mother-of-pearl. Round lustrous pearls are used in jewellery.
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pearl
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Source Word
pearl
IPA(Pronunciation)
Noun
countable
uncountable
figuratively
dated
obsolete
euphemistic
slang
vulgar
A
shelly
concretion,
usually
rounded,
and
having
a
brilliant
luster,
with
varying
tints,
found
in
the
mantle,
or
between
the
mantle
and
shell,
of
certain
bivalve
mollusks,
especially
in
the
pearl
oysters
and
river
mussels,
and
sometimes
in
certain
univalves.
It
is
usually
due
to
a
secretion
of
shelly
substance
around
some
irritating
foreign
particle.
Its
substance
is
the
same
as
nacre,
or
mother-of-pearl.
Round
lustrous
pearls
are
used
in
jewellery.
Japanese Meaning
真珠：貝類の外套膜と殻の間で、異物の刺激により分泌される貝殻質が堆積して形成される、丸く光沢のある宝石状の物質。主にパールオイスターや淡水貝で見られ、装飾品として用いられる。
Sense（1）
A
shelly
concretion,
usually
rounded,
and
having
a
brilliant
luster,
with
varying
tints,
found
in
the
mantle,
or
between
the
mantle
and
shell,
of
certain
bivalve
mollusks,
especially
in
the
pearl
oysters
and
river
mussels,
and
sometimes
in
certain
univalves.
It
is
usually
due
to
a
secretion
of
shelly
substance
around
some
irritating
foreign
particle.
Its
substance
is
the
same
as
nacre,
or
mother-of-pearl.
Round
lustrous
pearls
are
used
in
jewellery.
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（ plural ）
