Definition of optical isomerism
(Chem.)
the
condition
or
relation
of
certain
(
isomeric
)
substances
,
which
,
while
chemically
identical
(
in
that
they
have
the
same
composition
,
the
same
molecular
weights
,
and
the
same
ultimate
constitution
),
are
yet
physically
different
,
as
in
their
action
on
polarized
light
,
as
dextro-
and
lævo-tartaric
acids
,
or
the
sugars
galactose
and
glucose
.
In
such
compounds
there
is
usually
at
least
one
unsymmetrical
carbon
atom
and
typically
more
than
one
.
See
Unsymmetrical
.
See also:
Isomerism
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