naphthyl group

[naf-thil groop, nap-thil]

noun

Chemistry.

1. 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.

2. 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.