1. That may be detected.

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

• delectables,
• detestible,
• detectible,
• dedectible,
• delectible,
• detecable,
• delectiable,
• deeuctable,
• detectibve,
• retactable,
• delictable,
• detacable,
• decuctable,
• dilectable,
• detactable,
• detuctable,
• detachtable,
• detectiable,
• defectable,
• destectable

• deductive,
• detected,
• detective,
• detecting,
• detection,
• deductible,
• detector,
• detested,
• detestable,
• detestably,
• deducted.

The adjective form of "detectable" is "detectable" itself.

The plural form of "detectable" is "detectables".

The singular form of the word "detectable" is "detectable". The word does not change in its singular form.