Definition of rainfast in English:

rainfast

Line breaks: rain|fast
Pronunciation: /ˈreɪnfɑːst/

Entry from British & World English dictionary

adjective

(Of a chemical spray or other substance) not able to be washed away by rain.

Definition of rainfast in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something