Plural of anthesis; the period during which a flower is fully open and functional, especially ready for pollination.
From Greek 'anthesis' (flowering, bloom, from 'anthos' meaning flower). This botanical term entered English via Latin in the 18th century.
Plants don't just bloom once and stay that way—flowers go through precise stages, and 'anthesis' marks the exact window when a flower is 'live' and working to attract pollinators, which might only last a few hours or days.
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