1. That distinguishes. Diacritical marks, marks that distinguish letters of the alphabet which resemble each other.

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

• acritical,
• hipacritical,
• iscritical,
• siacritical,
• xiacritical,
• ciacritical,
• fiacritical,
• riacritical,
• eiacritical,
• duacritical,
• djacritical,
• dkacritical,
• diacrtical,
• diacrittical,
• dyacritical,
• diacratical,
• demcratical,
• Diaretical,
• diaporetical,
• Diaphisical

• diacritic,
• critical,
• discretional.

The adjective form of the word "diacritical" is "diacritic".

The plural form of the word "diacritical" is "diacriticals".

The singular form of the word "diacritical" is "diacritic"