A polywere is a Were who has more than one Wereside. This is now a disused term. Please see Polytherian.
References
Polywere used in a discussion on AHWW, June 9, 1996. https://groups.google.com/forum/?fromgroups#!searchin/alt.horror.werewolves/polywere%7Csort:date/alt.horror.werewolves/i8t_dIsvFac/epuGUdssnocJ
Polywere on Shifters.org Encyclopedia -http://web.archive.org/web/20060821231409/http://www.therianthropy.org/SO/terms-p.htm