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Also called alpha-naphthyl group.��Also called alpha-naphthyl radical.��the univalent group C 1 0 H 7 –, having a replaceable hydrogen atom in the first, or alpha, position; 1-naphthyl group.

Also called beta-naphthyl radical.��Also called beta-naphthyl group.��the univalent group C 1 0 H 7 –, having a replaceable hydrogen atom in the second, or beta, position; 2-naphthyl group.