LITUUS
\lˈɪtʌəs], \lˈɪtʌəs], \l_ˈɪ_t_ʌ_ə_s]\
Definitions of LITUUS
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An instrument of martial music; a kind of trumpet of a somewhat curved form and shrill note.

A spiral whose polar equation is r2 = 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.
By Oddity Software

An instrument of martial music; a kind of trumpet of a somewhat curved form and shrill note.

A spiral whose polar equation is r2 = 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.
By Noah Webster.