Nap·a (n?p??) A city of northern California northeast of Oakland. It is a center of the Napa Valley, a mountainous region that is famous for its vineyards.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.napa (?næp?) n1. (Tanning) a type of leather made by tanning sheepskin2. (Plants) a broad-leafed plant used as a vegetable in east Asia. Also called: Chinese cabbage or celery cabbage Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014nap?a or nap?pa (?næp ?) n. (sometimes cap.) a soft, tawed leather usu. made from sheepskin or lambskin, used for gloves, shoes, luggage, etc. [1890?95, Amer.; after Napa, California] Nap?a (?næp ?) n. a city in W California: center of wine-producing region. 57,320. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.