σεῖστρος
σεῖστρος, yellow-rattle, Rhinanthus major
Alas! Could not find the search term σεῖστρος.
Found the closest form σειστὸς. Other nearby forms can be found in the wordwheel, or perhaps try searching again without accents.
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Parsed as:
✓ masculine nominative singular of σειστός
No checked forms of σεῖστρος in the morphology database.