ترین

Suffix

 * 1) A suffix forming the superlative degree of an adjective.

Etymology
From +. The superlative sense is not inherited from Middle Persian. Indeed, the modern distinction between comparative and superlative  did not exist in Early New Persian (late first millennium), when both forms could be used for both senses.

Suffix

 * 1) more; -est;

Usage notes
Unlike those suffixed with, an adjective suffixed with precedes the attributed noun.

The form of the adjective cannot be used alone as a predicate. It must either be followed by a noun, or the synonymous construction must be used.