Last Updated：2025/11/19
(neurology, chiefly US) A genetic disorder caused by the presence of all or part of a third copy of chromosome 21 (a chromosomal excess), whereby the patients bear a certain resemblance to the Mongoloid race, such as a small head and tilted eyelids, and typically have a delay in cognitive ability and physical growth.
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Down syndrome
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Source Word
Down syndrome
IPA(Pronunciation)
Proper noun
US
(neurology,
chiefly
US)
A
genetic
disorder
caused
by
the
presence
of
all
or
part
of
a
third
copy
of
chromosome
21
(a
chromosomal
excess),
whereby
the
patients
bear
a
certain
resemblance
to
the
Mongoloid
race,
such
as
a
small
head
and
tilted
eyelids,
and
typically
have
a
delay
in
cognitive
ability
and
physical
growth.
Japanese Meaning
21番染色体が全体あるいは一部重複して存在する遺伝性疾患で、特徴として小さい頭部、傾いた眼瞼などの顔貌が見られ、認知能力や身体発達の遅れが生じる状態（主に米国における神経学分野での表現）
Sense（1）
(neurology,
chiefly
US)
A
genetic
disorder
caused
by
the
presence
of
all
or
part
of
a
third
copy
of
chromosome
21
(a
chromosomal
excess),
whereby
the
patients
bear
a
certain
resemblance
to
the
Mongoloid
race,
such
as
a
small
head
and
tilted
eyelids,
and
typically
have
a
delay
in
cognitive
ability
and
physical
growth.
