Relating to, belonging to, or having the characteristics of plants in the Amaryllidaceae family.
From Amaryllidaceae (the family name) with the Latin-style suffix -ous (meaning 'full of' or 'having the quality of'), creating an adjective form used in botanical descriptions and scientific writing.
Botanists created a whole chain of words from one poetic name: Amaryllis → Amaryllidaceae → amaryllidaceous, each form serving a different grammatical purpose, showing how Latin endings are like Lego blocks in scientific language.
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