par·a·bi·o·sis (p?r??-b?-??s?s)n. pl. par·a·bi·o·ses (-s?z) 1. The natural or surgical union of anatomical parts of two organisms, usually involving exchange of blood, as in the development of conjoined twins or in certain transplant operations.2. A temporary suspension of conductivity or excitability in a nerve.par?a·bi·ot?ic (-?t??k) adj.par?a·bi·ot?i·cal·ly adv.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.parabiotically (?pær?ba???t?kl?) adv (Biology) in a parabiotic mannerCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014