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Pronunciation varies by accent · noun
Any of a group of cyanine dyes that have a line of seven -CH= groups.
Use heptamethine when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Heptamethine means Any of a group of cyanine dyes that have a line of seven -CH= groups.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use heptamethine where its definition matches the intended context.
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