herbicide(redirected from weed killer)
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an agent that is destructive to weeds or causes an alteration in their normal growth.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Any chemical compound designed to kill plants. Herbicides have been used in military operations for deforestation, but the U.S. military excludes herbicides from being classified as chemical-warfare agents.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
herbicideany chemical that kills plants. Herbicides can be highly selective. For example, 2,4-D only kills DICOTYLEDONS (broad-leaved plants), leaving MONOCOTYLEDONS unharmed.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005