群ぐん速そく度どMeaningsNoun1. group velocity (in fibre optics, fiber optics)Kanji used群a pack (e.g. of dogs)速fast度degreesPitch accentぐんそくどComposed of群ぐんgroup; bunch; crowd; throng; swarm; band; herd; school (of fish)Noun速そく度どspeed; velocity; pace; rateNoun