An instrument with a rod, supposed to avert the occurrence of hailstorms.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "paragrandine" in a sentence
"[Footnote: The paragrandine, or, as it is called in French, the paragrele, is a species of conductor by which it has been hoped to protect the harvests in countries particularly exposed to damage by hail."