Pelorus
Pronunciation : Pe*lo"rus, n. [After Pelorus
Part of Speech : said
Definition : Defn: An instrument similar to a mariner's compass, but without magnetic needles, and having two sight vanes by which bearings are taken, esp. such as cannot be taken by the compass.
to have been Hannibal's pilot when he left Italy.] (Navig.)
Source : Webster's Unabridged Dictionary, 1913