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portolano

[pawr-tl-ah-noh, pohr-] /ˌpɔr tlˈɑ noʊ, ˌpoʊr-/
noun, plural portolanos, portolani
[pawr-tl-ah-nee, pohr-] /ˌpɔr tlˈɑ ni, ˌpoʊr-/ (Show IPA)
1.
a descriptive atlas of the Middle Ages, giving sailing directions and providing charts showing rhumb lines and the location of ports and various coastal features.
Also called rutter.
Origin
1855-1860
1855-60; < Italian: shipmaster's guidebook; earlier, harbor master < Medieval Latin portulānus. See port1, -ule, -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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