最終更新日：2022/12/07
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Any item considered to be of third order. / A tertiary colour. / (geology) Something from the Tertiary Period (the former term for the geologic period from 65 million to 2.58 million years ago).
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tertiary
noun
意味（3）
意味（5）
(military)
A
large
stage
in
some
extremely
powerful
thermonuclear
weapons
(resembling
a
greatly-enlarged
secondary)
which
is
compressed
by
the
explosion
of
the
secondary
until
ignition
of
nuclear
fusion
takes
place,
in
much
the
same
manner
as
the
secondary
is
imploded
by
the
primary,
and
which
can
allow
for
the
attainment
of
yields
of
many
tens
or
even
hundreds
of
megatons,
and
likely
even
greater;
not
used
in
modern
weapons
due
to
a
greater
focus
on
the
accurate
use
of
sub-megaton
weapons,
the
tremendous
size
of
weapons
incorporating
a
tertiary,
and
the
lack
of
targets
whose
destruction
would
necessitate
the
use
of
a
three-stage
weapon.
