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(Agriculture) a synthetic auxin widely used as a weedkiller; 2,4-dichlorophenoxyacetic acid

di•chlo′ro•phe•nox′y•a•ce′tic ac′id

(daɪˈklɔr oʊ fɪˈnɒk si əˈsi tɪk, -əˈsɛt ɪk, daɪˈkloʊr-, daɪˌklɔr oʊ fɪˌnɒk-, daɪˌkloʊr-)

a crystalline powder, C8H6O3Cl2, used for killing weeds. Also called 2,4-D.
References in periodicals archive ?
This conclusion supports the 2005 and 2007 draft assessments issued by PMRA, which found that 2,4-D can be used safely on lawn, turf, agricultural, forestry and industrial sites, when label directions are followed.
Our hypothesis is that 2,4-D and MCPA increase proliferation at low concentration in presence and absence of FGFs.
These may arise from 2,4-D itself, from breakdown products or dioxin contamination, or from a combination of chemicals, according to a research report published in the journal Paediatrics and Child Health in April.
Although chemical use has been reduced by the agricultural industry in recent years, soil and groundwater pollution is still problematic because of the build-up of chemicals such as 2,4-D (2,4-dichloro-phenoxyacetic acid), a man-made chemical introduced in 1944 that selectively acts against broad-leaved weeds, leaving cereals and grasses undamaged, increasing food production with relatively little labor.
One chemical, commonly applied to eliminate Eurasian milfoil and other invasive weeds, is 2,4-D.
In 2011, a new 2,4-D product namely 2,4-D choline has been under industrial production by Dow AgroSciences.
Embryos were added to a vial containing food with chlorophenoxy herbicides in the following concentrations (1[micro]M and 3mM 2,4-D or MCPA and control).
OBJECTIVE: We estimated 2,4-dichlorophenoxyacetic acid (2,4-D) exposure and systemic dose in farm family members following an application of 2,4-D on their farm.
Considering these three aspects, the media showing these three desired characteristics were those containing the 2,4-D growth regulator at concentrations of 6.
It is a simple idea, but even some presumptive professionals seem unable to grasp it -- as evidenced by the decision by the International Agency for Research on Cancer, a component of the World Health Organization, to classify the commonly used herbicide 2,4-D as "possibly carcinogenic to humans.