The Collaborative International Dictionary of English v.0.48:
eightsome \eight"some\ n. eight people considered as a unit; as, there was an eightsome ahead of us on the golf course. Syn: octet, octette. [WordNet 1.5] 2. a Scottish reel for eight dancers. [WordNet 1.5]WordNet (r) 3.0 (2006):
eightsome n 1: eight people considered as a unit [syn: octet, octette, eightsome] 2: a Scottish reel for eight dancers