1. A curve, invented by Diocles, to trisect a plane angle and to construct two geometric means between two given straight lines.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• cisoid,
• xissoid,
• vissoid,
• fissoid,
• cussoid,
• cjssoid,
• ckssoid,
• cossoid,
• c9ssoid,
• c8ssoid,
• ciasoid,
• cixsoid,
• ciwsoid,
• cisaoid,
• ciszoid,
• cisxoid,
• cisssoid,
• sissoid,
• cysoid,
• Cishoed

The plural of the "Cissoid" can be the "cissoids".

The singular of the "Cissoid" can be the "Cissoid".