Having two opposite openings or mouths; relating to organisms with dual mouth structures.
From amphi- + stoma + -ous (full of/characterized by). This older adjectival form appears in classical parasitology texts predating modern terminology.
This word was popular in Victorian-era naturalist writings when scientists first marveled at discovering these strange two-mouthed parasites under early microscopes—it sparked entire new fields of zoology.
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