1. That may be added.

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

• addable,
• zddible,
• sddible,
• wddible,
• qddible,
• asdible,
• axdible,
• acdible,
• afdible,
• ardible,
• aedible,
• adsible,
• adxible,
• adcible,
• adfible,
• adible,
• adddible,
• Adiblee,
• Addebble,
• Adeeble

• ad blitz,
• advil,
• addable,
• audible.

The adjective form of the word "addible" is "addable".

The plural form of "addible" is "addibles".

The singular form of the word "addible" is "addible". It is an adjective that is not typically used in the singular.