Pa·rá rubber (pä-rä?, p?r??)n. Rubber obtained from the rubber tree Hevea brasiliensis.[After Pará, a state of northern Brazil.]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.Pará rubber (p??r??; ?p??r?) n (Elements & Compounds) a South American rubber obtained from any of various euphorbiaceous trees of the genus Hevea, esp H. brasiliensis. See also rubber tree[C19: from Pará]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014