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/ˈflæt.wəɹm/ · noun
Any of very many parasitic or free-living worms, of the phylum Platyhelminthes, having a flattened body with no skeleton or body cavity..
Use flatworm when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Flatworm means Any of very many parasitic or free-living worms, of the phylum Platyhelminthes, having a flattened body with no skeleton or body cavity..
Common synonyms include platyhelminth.
The opposite depends on the specific sense.
Use flatworm where its definition matches the intended context.
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