Definition of rainfast in English:

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Pronunciation: /ˈreɪnfɑːst/


(Of a chemical spray or other substance) not able to be washed away by rain.
Example sentences
  • This spray is longer lasting than the copper sprays used on tomatoes, and it is rainfast.
  • Allow at least six hours for the glyphosate products to become rainfast.
  • This product is cheaper, has a better safety profile, controls both types of rhizomes and is rainfast after 2 hours.

For editors and proofreaders

Line breaks: rain|fast

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