Binaphthyl

/baɪˈnæfθɪl/ noun

A chemical compound consisting of two naphthalene molecules bonded together.

From 'bi-' (two) + 'naphthalene' + '-yl' (a chemistry suffix indicating a radical or group). Naphthalene comes from the Arabic 'naft' meaning petroleum. The compound was named by chemists to indicate its structure: two naphthalene units joined together.

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