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| 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. |
mesoblast mes·o·blast (měz'ə-blāst', měs'-)
n.
The middle germinal layer of an early embryo, consisting of undifferentiated cells destined to become the mesoderm.