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something that identifies; an identifying mark or tag.
radioactive label a radioisotope that is incorporated into a compound to mark it.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
radioactive labelany substance that emits an ionizing radiation which is detectable and can be used to locate it.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005