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lituus 連鎖螺線 連鎖螺線 Lituus \Lit"u*us\, n.; pl. {Litui}. [L.]
1. (Rom. Antig.) (a) A curved staff used by the augurs in quartering the heavens. (b) An instrument of martial music; a kind of trumpet of a somewhat curved form and shrill note. [1913 Webster] 2. (Math.) 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. [1913 Webster]
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