breth

Etymology
From. The declension switched from i-stem to ā-stem by analogy with, which is the foundation of the verbal nouns of all derivatives of.

Noun

 * : carrying, bearing
 * 1) judgement

Inflection
Etymologically this should be an i-stem with nominative singular. This alternative nominative singular is known to exist, but only an ā-stem inflection is attested.