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[pawr-tl-ah-noh, pohr-] /ˌpɔr tlˈɑ noʊ, ˌpoʊr-/
noun, plural portolanos, portolani
[pawr-tl-ah-nee, pohr-] /ˌpɔr tlˈɑ ni, ˌpoʊr-/ (Show IPA)
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 of portolano
1855-60; < Italian: shipmaster's guidebook; earlier, harbor master < Medieval Latin portulānus. See port1, -ule, -an Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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