Definition of "lituus" [‖Lit•u•us]

• A military trumpet. (noun)
• A curve with polar equation , where a is a constant. (noun)

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• "This sort of staff is crooked at one end, and is called lituus; they make use of it in quartering out the regions of the heavens when engaged in divination from the flight of birds; Romulus, who was himself a great diviner, made use of it."
• "Three hundred years after its last sounding, a long-lost instrument called the lituus -- one of Johann Sebastian Bach's go-to horns -- is back from the dead."
• "He wore the red-and-purple-striped toga, and carried a staff, the lituus, topped by a curlicue."