Plural of achillea; multiple plants from the yarrow genus.
Regular Latin-based plural of achillea, using the standard botanical -as ending for feminine nouns derived from Greek. Common in botanical texts and gardening guides.
In botany, the same plant can have a fancy Latin genus name (Achillea) and a common name (yarrow), so calling multiple plants 'achilleas' is how scientists talk, while gardeners just say 'yarrows.'
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