'pain-assessing' is a compound word formed from 'pain' and 'assessing', where 'pain' refers to physical or emotional discomfort and 'assessing' means evaluating or estimating the nature, ability, or quality of something.

The word 'pain-assessing' was created in modern English by combining 'pain' and the present participle 'assessing' to describe tools or methods that evaluate pain.

Initially, it simply described the act of evaluating pain, and this meaning has remained consistent in its usage.