1. Hydra-like.

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

• hudrosis,
• hydric,
• hydride,
• gydroid,
• hudroid,
• hydeoid,
• hydrroid,
• hydrouid,
• hydroied,
• hydriod,
• hidroid,
• hydrolis,
• hydroxid,
• hyyoid,
• pydrosis,
• vyroid,
• hydruia,
• hydrona,
• Hydriodia,
• Hydroidee

• hybrid,
• hydride,
• hydrated.

The adjective form of the word "hydroid" is "hydroidal".

The plural of the "hydroid" can be the "hydroids".

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