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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
vivax malaria vi·vax malaria (vī'vāks')
n.
Malaria in which the paroxysms recur every third day, counting inclusively, and are induced by the release of merozoites and their invasion of new red blood cells. Also called tertian malaria.