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Pronunciation varies by accent · noun
Any extinct dinosaur of the clade Avialae, together with any living descendant of class Aves (the birds)..
Use avialian when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Avialian means Any extinct dinosaur of the clade Avialae, together with any living descendant of class Aves (the birds)..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use avialian where its definition matches the intended context.
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