Having the characteristic of or relating to plants with seeds protected inside a vessel or fruit (flowering plants).
From Greek 'angeion' (vessel) + 'sperma' (seed) + '-atous' (characterized by). This is a more formal botanical suffix variant, describing the key reproductive feature of angiosperms.
Angiospermatous is the fancy way of saying a plant is an angiosperm—it emphasizes the actual structure of having seeds in containers, which is what makes flowering plants so successful.
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