PA·BA (pä?b?)n. A crystalline para form of aminobenzoic acid that is part of the vitamin B complex, sometimes used in sunscreens.[p(ara)-a(mino)b(enzoic) a(cid).]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.PABA (?p??b?) n acronym for (Elements & Compounds) para-aminobenzoic acidCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014PABA (?p? b?) n. para-aminobenzoic acid. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.