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(Elements & Compounds) another name for trichlorophenoxyacetic acid
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

tri•chlo′ro•phe•nox•y•a•ce′tic ac′id

(traɪˈklɔr oʊ fəˌnɒk si əˈsi tɪk, -ˈsɛt ɪk, -ˈkloʊr-, -ˌklɔr-, -ˌkloʊr-)

a light tan, water-insoluble solid, C8H5Cl3O3, used chiefly for killing weeds. Also called 2,4,5-T
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Nobody in the United States has been exposed to the herbicide 2,4,5-T since 1979.
During the decade of the 1970s, from the banning of DDT in 1972 through the controversy over the herbicide 2,4,5-T and its associated dioxin contaminant at the end of the decade, Dow would fight these "coercive utopians" and their vision of a government more responsive to the health and ecological concerns of ordinary Americans.
Agent Orange was a 50:50 mixture of 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) and 2,4-dichlorophenoxyacetic acid (2,4-D).
Then in the 1960s, 2,4-D and 2,4,5-T became the two key ingredients in Agent Orange, the toxic defoliant used in Vietnam.
The phenoxyacetic acids 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T) constituted Hormoslyr (Gullvik, Sweden), one of the most widely used pesticides in Sweden during that period.
They relate specifically to the following substances: 2,4,5-T, chlorobenzilate, parathion-methyl, monocrotophos and phosphamidon (replacing the provisional import decisions 2000/657/EC) and polybrominated biphenyls (PBB -replacing the earlier import decision of 1995 in order particularly to take into account the total ban on PBBs since 1993).
In this cheerfully titled article intended to help the forest landowner rid the woodlot of diseased, defective, and weed trees, an easy and inexpensive alternative to the age-old "armstrong" system of axe and saw is proffered: basal bark spraying with a mixture of herbicide 2,4,5-T and fuel oil.
It was a mixture of the herbicides 2,4-D and 2,4,5-T and also contained dioxin generated during formulation of 2,4,5-T.
They all relate to a 1949 chemical accident in Nitro, West Virginia, that involved an explosion in a pressurized chemical reactor that produced 2,4,5-T, one component of Agent Orange.
2,4-D was one of the two active ingredients used in the herbicide; the other was 2,4,5-trichlorophenol (2,4,5-T).