Plural of aroid or a taxonomic grouping referring to members of the arum family.
From 'aroid' with standard plural suffix '-es.' In scientific nomenclature, this represents the grouping of plants classified within the aroid category.
When botanists pluralize scientific terms, they often keep Latin plural forms like 'aroides' even in English, which is why we have both 'formulas' and 'formulae'—it's a quirk where scientific prestige and ancient languages keep older plurals alive.
Complete word intelligence in one call. Free tier — 50 lookups/day.