IPA: /əˈliːviˌeɪtə/
KK: /əˈliːviˌeɪtər/
A person or thing that makes a situation better or less severe.
The new medication served as an alleviator of her chronic pain.
Alleviator → It is formed from "alleviare" (meaning to lighten or relieve) and "-or" (meaning one who). The word "alleviator" refers to one who lightens or relieves a burden or pain.
Think of someone who 'lightens' ('alleviare') a burden — that's why an alleviator is someone who helps relieve pain or difficulty.