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Pronunciation varies by accent · noun
(aviation, dated) A hydroaeroplane having two supporting planes..
Use hydrobiplane when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Hydrobiplane means (aviation, dated) A hydroaeroplane having two supporting planes..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use hydrobiplane where its definition matches the intended context.
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