أساس البلاغة is a book written by Abu Al-Qasim Mahmud bin Amr bin Ahmad, also known as Al-Zamakhshari (d. 538 AH). It is considered one of the most important ancient linguistic dictionaries that deals with Arabic words and their eloquence. The book includes literary figures, poetic styles, and rhetorical expressions, with materials arranged alphabetically based on the dictionary's letters.

The author presents the word in Arabic and provides an explanation enriched with Quranic verses, Prophetic sayings, Arabic poetry, and proverbs. He then mentions the figurative uses of the explained word. This comprehensive reference book is available for Android users and is free to download.