1. A sort of fuller's earth.

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

• specaite,
• smette,
• amectite,
• zmectite,
• xmectite,
• dmectite,
• emectite,
• wmectite,
• snectite,
• skectite,
• sjectite,
• smwctite,
• smsctite,
• smectiyte,
• smecctite,
• smectiite,
• Smectyte,
• smeltie,
• simeinite,
• sextitte

The adjective form of the word "smectite" is "smectitic".

The plural form of the word "smectite" is "smectites".

The singular form of the word "Smectite" is "Smectite". It is already a singular noun.