antidesiccant
noun
an·ti·des·ic·cant
ˌan-tē-ˈde-si-kənt
ˌan-tī-
: a protective coating applied to the foliage of a plant to reduce moisture loss : a substance that prevents desiccation
… spray broadleaf evergreens with an antidesiccant to ward off winter dehydration and windburn.—Jessica Damiano
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Merriam-Webster unabridged
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