Origin: before 1000; Middle English redel, redels (noun),
Old English rǣdels(
e) counsel, opinion, imagination, riddle (
rǣd(
an) to counsel,
rede +
-els(
e) deverbal noun suffix) with loss of
-s- in ME through confusion with the plural form of the noun suffix
-el -le (
compare burial); cognate with
German Rätsel, Dutch raadsel