pinnation

[ pi-ney-shuh n ]
/ pɪˈneɪ ʃən /

noun Botany.

pinnate condition or formation.

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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.

Origin of pinnation

First recorded in 1870–75; pinnate + -ion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020