honorary co-authorship

A practice in which senior researchers are listed as co-authors—despite having had little to do with the work involved in publishing original research reports—on research reports that are the works of others,e.g., undergraduates and postdoctoral fellows working in their lab
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

honorary co-authorship

Spurious co-authorship A practice in which the name of senior researchers are added to research reports that are the work of others–eg, undergraduates and postdoctoral fellows working in their lab. See Authorship, Baltimore affair, CV-weighing, Darsee affair.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.