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Pronunciation varies by accent · noun
Any extinct flightless bird of the family †Sylviornithidae.
Use sylviornithid when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sylviornithid means Any extinct flightless bird of the family †Sylviornithidae.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use sylviornithid where its definition matches the intended context.
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