|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.|
primordium pri·mor·di·um (prī-môr'dē-əm)
n. pl. pri·mor·di·a (-dē-ə)
An aggregation of cells in the embryo indicating the first trace of an organ or structure.