Relating to, composed of, or resembling herbage; having the characteristics of grass or herbaceous plants.
Formed from 'herbage' plus the Latin suffix '-ious' (full of, characterized by). This is a rare or archaic variant of 'herbaceous,' combining the noun herbage with an adjectival ending to create a more direct reference to plant-like qualities.
This word is so rarely used that most modern dictionaries don't include it—it's a fossil of English botanical vocabulary that got superseded by 'herbaceous' in the 18th century. Language evolves by dropping synonyms, and herbagious lost the competition.
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