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fast travel
noun
fast reactor
noun
(nuclear
physics,
engineering)
A
nuclear
reactor
with
no
moderator,
using
fast
neutrons
directly
in
a
controlled
fission
chain
reaction
without
slowing
them
down;
this
allows
for
a
much
more
compact
reactor,
and
causes
the
reactor
to
use
fissile
material
much
more
efficiently,
and
to
generate
larger
quantities
of
high-energy
neutrons
which
can
be
used
for
breeding
more
fissile
material
or
producing
other
useful
radioactive
nuclides,
but
requires
the
use
of
highly-enriched
uranium
(at
least
20%
uranium-235)
or
other
fuel
containing
a
similarly
high
concentration
of
fissile
material.
as fast as one's legs could carry one
tensor fasciae latae
noun
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