Relating to or belonging to the aroid or arum family of plants.
From 'aroid' plus the adjective-forming suffix '-eous' (from Latin '-eus'). This creates a Latinate botanical adjective meaning 'of or pertaining to aroids.'
Botanical Latin suffixes like '-eous' are so standardized that botanists worldwide use the same 'secret language'—an Italian botanist and a Japanese one can read a plant description and instantly understand the family relationships just from these Latin endings.
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