sphairistike means an early racquet sport that evolved into tennis. Lexicurio rates it Sui generis — a strength score of 92 out of 100.
Etymology
Ancient Greek sphairistike, "skill in playing at ball".
noun
- An early racquet sport that evolved into tennis.“The new appliances of the game sold under the rather too learned name of ‘sphairistikè’ have been lightened without, like their ancient representatives, being increased in size.”