Noun
A
long-chain
unsaturated fatty acid
,
CH
(
CH
)
CH
=
CH
(
CH
)
COOH
,
found
in
rapeseed
and
mustard
seed
oils
;
strictly
,
the
cis-isomer
of
the
molecule
(
the
trans-isomer
is
called
''
brassidic acid
'').