Also i·so·pyc·nal [ahy-suh-pik-nl] /ˌaɪ səˈpɪk nl/. having the same density.
a line drawn on a map connecting all points having the same density, as of water or air.
Origin of isopycnic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a line on a map connecting points of equal atmospheric density
Word Origin for isopycnal
C19: from iso- + Greek puknos thick
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012