analyse (v.) Look up analyse at
chiefly British English spelling of analyze (q.v.), which was the former spelling there (as in Johnson's dictionary). In 17c. analize also was used.
Analyse is better than analyze, but merely as being the one of the two equally indefensible forms that has won. The correct but now impossible form would be analysize (or analysise), with analysist for existing analyst. [Fowler]