portolano

[ pawr-tl-ah-noh, pohr- ]
/ ˌpɔr tlˈɑ noʊ, ˌpoʊr- /

noun, plural por·to·la·nos, por·to·la·ni [pawr-tl-ah-nee, pohr-] /ˌpɔr tlˈɑ ni, ˌpoʊr-/.

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

Example sentences from the Web for portolani