The state or quality of being bisinuate; having two sinuous curves or folds.
From 'bisinuate' + '-ion' (suffix forming nouns of state or action). This abstract noun form emerged in botanical and zoological literature to describe morphological characteristics.
Bisinuation is textbook scientific nomenclature laziness—instead of inventing a completely new word, scientists just take 'sinuation,' add 'bis-,' and call it a day, which is actually genius efficiency in how technical language develops.
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