|a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|around; surrounding; on all sides: circumlocution; circumrotate|
|[from Latin circum around, from circus circle]|
Around; about: circumduction.
A prefix meaning "around", as in circumscribe, to draw a figure around another figure.