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pelorus

The Oxford Companion to Ships and the Sea | 2006 | Copyright

pelorus, a circular ring fitted to the rim of a compass bowl and carrying two sighting vanes, used to take azimuths of celestial objects. The ring can be easily revolved and the compass bearing read off by sighting the vanes on the required object. Alternatively, the ring can be fitted to a ‘dumb’ compass (without a directive element) which can be set by hand to the course of the ship before taking a bearing.

The word comes from the name of Hannibal's pilot, probably a Greek, who sided with the Carthaginians, assisted Hannibal to get his troops across to Europe, and kept him in touch with Carthage by sea.

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pelorus

The Oxford Essential Dictionary of the U.S. Military | 2001 | Copyright

pelorus pəˈlawrəs n. a sighting device on a ship for taking the relative bearings of a distant object.
mid 19th cent.: perhaps from Pelorus, said to be the name of Hannibal's pilot.

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pelorus

Oxford Dictionary of Rhymes | 2007 | Copyright

pelorus •Arras, embarrass, harass •gynandrous, polyandrous •Pancras • charas • Tatras • disastrous •ferrous • leprous • ambidextrous •Carreras, mayoress •scabrous •cirrus, Pyrrhus •chivalrous •citrous, citrus •ludicrous • tenebrous •Cyrus, Epirus, papyrus, virus •fibrous • hydrous • Cyprus •retrovirus • monstrous •brachiosaurus, brontosaurus, canorous, chorus, Epidaurus, Horus, megalosaurus, pelorus, porous, sorus, stegosaurus, Taurus, thesaurus, torus, tyrannosaurus •walrus •ochrous (US ocherous) •cumbrous • wondrous • lustrous •Algeciras, Severus •desirous •Arcturus, Epicurus, Honduras •barbarous • tuberous • slumberous •Cerberus • rapturous •lecherous, treacherous •torturous • vulturous • Pandarus •slanderous • ponderous •malodorous, odorous •thunderous • murderous •carboniferous, coniferous, cruciferous, melliferous, odoriferous, pestiferous, somniferous, splendiferous, umbelliferous, vociferous •phosphorous, phosphorus •sulphurous (US sulfurous) •Anaxagoras, Pythagoras •clangorous, languorous •rigorous, vigorous •dangerous • verdurous •cankerous, cantankerous, rancorous •decorous • Icarus • valorous •dolorous • idolatrous •amorous, clamorous, glamorous •timorous •humerus, humorous, numerous •murmurous • generous • sonorous •onerous • obstreperous • Hesperus •vaporous • viviparous • viperous •Bosporus, prosperous •stuporous • cancerous •Monoceros, rhinoceros •sorcerous • adventurous • Tartarus •nectarous • dexterous • traitorous •preposterous • slaughterous •boisterous, roisterous •uterus • adulterous • stertorous •cadaverous • feverous •carnivorous, herbivorous, insectivorous, omnivorous •Lazarus

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