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.
2. Math.
A spiral whose polar equation is r2θ = 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.
© Webster 1913.