Home › Words › O › orthochessorthochess/ˌɔːθəˈt͡ʃɛs/orthochess means the conventional game and rules of chess.orthochess is pronounced /ˌɔːθəˈt͡ʃɛs/.EtymologyFrom ortho- + chess, probably as a clipping of orthodox chess.nounThe conventional game and rules of chess.Definitions & examples from Wiktionary (CC BY-SA 3.0).