| 1. | Also called alpha-naphthyl group, alpha-naphthyl radical. the univalent group C1 0H7–, having a replaceable hydrogen atom in the first, or alpha, position; 1-naphthyl group. |
| 2. | Also called beta-naphthyl group, beta-naphthyl radical. the univalent group C1 0H7–, having a replaceable hydrogen atom in the second, or beta, position; 2-naphthyl group. |