Relating to or resembling grain or cereal crops; of the nature of grain.
From Latin frumentum (grain) with the suffix '-aceous' (from Latin -aceus, meaning 'of the nature of'). This scholarly adjective was formed to describe grain-like or grain-related qualities.
The suffix '-aceous' is how scientists describe plant families and characteristics—like 'herbaceous' for herb-like plants or 'rosaceous' for the rose family—so 'frumentaceous' is the formal scientific way of saying 'grain-like,' though it's rarely used today.
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