Elucidation: A material entity that is a proper part of some larger object, but is not demarcated from the remainder of this object by any physical discontinuities (thus, it is not itself an object). Examples include your upper torso, the Western hemisphere of the planet earth. Source: Robert Arp, Barry Smith, and Andrew D. Spear: Building Ontologies with Basic Formal Ontology. The MIT Press Cambridge, Massachusetts London, England. ©2015 Massachusetts Institute of Technology. ISBN 978-0-262-52781-1, Glossary. https://www.ebi.ac.uk/ols4/ontologies/bfo/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FBFO_0000024