Containing, resembling, or relating to starch; having the nature or properties of starch.
From Latin amylum (starch) plus the suffix -aceous meaning 'of the nature of' or 'abounding in'. This suffix -aceous is used in scientific classification, as seen in plant families like Rosaceae (the rose family).
The suffix -aceous appears in plant family names like Fabaceae (legumes) and Asteraceae (daisies), so whenever botanists use it, they're echoing the same Latin root—amylaceous is basically saying 'of the starch family' in proper scientific dress.
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