In a circinate manner; in a way that moves, coils, or forms circular patterns.
From circinate (verb) plus the adverbial suffix -ly. Maintains the Latin root circinare (to make circular) while converting the adjective form into an adverb for describing how actions are performed.
This adverb is rare in everyday English but common in botanical writing—scientists needed a word to describe how ferns and vines unfurl, and 'circinately' lets them convey in one word what would take a sentence in ordinary language.
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