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Lituus

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Lituus

1. A curved staff used by the augurs in quartering the heavens. An instrument of martial music; a kind of trumpet of a somewhat curved form and shrill note.

2. (Science: mathematics) a spiral whose polar equation is r^2<theta/ = a; that is, a curve the square of whose radius vector varies inversely as the angle which the radius vector makes with a given line.