Last Updated：2025/11/21
(astronomy) A world-like planetoid of the Solar system, that is smaller than the classical planets. More specifically, any astronomical body which has a geology defined by hydrostatic equilibrium (and thus has taken the shape a body of water would take, as opposed to a small Solar System body), orbits the Sun (as opposed to a moon), and does not gravitationally dominate other bodies near its orbit (as opposed to a classical planet or, in IAU usage, as opposed to a planet).
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dwarf planet
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Source Word
dwarf planet
Noun
(astronomy)
A
world-like
planetoid
of
the
Solar
system,
that
is
smaller
than
the
classical
planets.
More
specifically,
any
astronomical
body
which
has
a
geology
defined
by
hydrostatic
equilibrium
(and
thus
has
taken
the
shape
a
body
of
water
would
take,
as
opposed
to
a
small
Solar
System
body),
orbits
the
Sun
(as
opposed
to
a
moon),
and
does
not
gravitationally
dominate
other
bodies
near
its
orbit
(as
opposed
to
a
classical
planet
or,
in
IAU
usage,
as
opposed
to
a
planet).
Japanese Meaning
太陽系に存在する、古典的な惑星よりも小型の軌道天体。 / 自らの重力によってほぼ球形を保っているが、周囲の天体を重力で支配しない天体。 / 太陽を公転するが、月などの衛星ではない天体。
Sense（1）
(astronomy)
A
world-like
planetoid
of
the
Solar
system,
that
is
smaller
than
the
classical
planets.
More
specifically,
any
astronomical
body
which
has
a
geology
defined
by
hydrostatic
equilibrium
(and
thus
has
taken
the
shape
a
body
of
water
would
take,
as
opposed
to
a
small
Solar
System
body),
orbits
the
Sun
(as
opposed
to
a
moon),
and
does
not
gravitationally
dominate
other
bodies
near
its
orbit
(as
opposed
to
a
classical
planet
or,
in
IAU
usage,
as
opposed
to
a
planet).
（ plural ）
