IPA: /ˈviːtoʊər/
KK: /ˈviːtoʊər/
A person who has the authority to reject or refuse approval for something, such as a law or decision.
The vetoer decided to reject the proposed legislation due to concerns about its impact.
Vetoer → It is formed from "veto" (from Latin "veto", meaning I forbid) and "-er" (meaning a person who). A vetoer is a person who forbids or rejects something.
Think of someone who has the power to 'forbid' ('veto') something — that's what a vetoer does.