Adjective
Especially
of
a
series
of
ideas
,
letters
,
words
,
etc
.:
intended
to
help
in
remembering
.
Noun
Something
(
especially
a
series
of
ideas
,
letters
,
words
,
etc
.)
used
to
help
in
remembering
a
thing
;
a
memory
aid
.