Definition of antipartticle
an`ti`part´ti`cle
Pronunciation:
ăn`tĭ`är´tĭ`k'l
n.
1.
(Physics)
A
fundamental
particle
which
has
the
same
mass
as
one
of
the
common
fundamental
particles
,
but
which
has
an
opposite
charge
,
and
for
which
certain
other
of
the
properties
(
e
.
g
.
baryon
number
,
strangeness
)
may
be
opposite
to
that
of
the
normal
particle
.
The
antiparticle
to
an
electron
is
called
a
positron
;
the
antiparticle
to
a
proton
is
called
an
antiproton
;
the
antiparticle
to
a
neutron
is
called
an
antineutron
.
When
a
particle
and
its
corresponding
antiparticle
collide
,
they
typically
annihilate
each
other
with
the
production
of
large
quantities
of
energy
,
usually
in
the
form
of
radiation
.
The
interaction
of
a
proton
and
antiproton
cause
annihilation
with
production
of
mesons
.
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