Yes Malone, I know the answer 'Caesarian' fits the clue on the
grid, and I can only assume that over the years, the two spellings
have become interchangeable - my encyclopedia's edition date
is 1920 !!!!
Anyhow, I just find it interesting that there are two spellings in English
and only one spelling (both for the operation and things pertaining to
Caesar) in French. :)