Of or relating to flowering plants that produce enclosed seeds, using the suffix form common in biological classification.
From Greek 'angeion' (vessel) + 'sperma' (seed) + '-ic' (relating to). This variant suffix creates another adjective form, reflecting different historical naming conventions in botanical nomenclature.
English sometimes has multiple technical adjectives for the same thing—angiospermic, angiospermal, and angiospermatous all mean the same thing, showing how scientific language evolved messily.
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