enigma canon: a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)
canon: a contrapuntal piece of music in which a melody in one part is imitated exactly in other parts
german measles: a contagious viral disease that is a milder form of measles lasting three or four days; can be damaging to a fetus during the first trimester