pentasomy

pentasomy

 [pen″tah-so´me]
the presence of three additional chromosomes of one type (e.g., 5 X chromosomes) in an otherwise diploid cell (2n + 3).
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
References in periodicals archive ?
Chromosome 8 pentasomy with partial tandem duplication of 11q23 in a case of de novo acute myeloid leukemia.
Sex chromosome tetrasomy and pentasomy. Pediatrics 1995; 96: 672-82.
Tetra-x-list (http://www.tetra-x-list@yahoogroups.com) is an online listserv support group serving families and individuals dealing with tetrasomy or pentasomy X (as well as triple X/tetra X and tetra X/penta X).