IPA: //aɪˈreɪtə//
KK: /aɪˈreɪtər/
More angry or furious than something else.
She was irater than ever after hearing the news.
Comparative: irater
Superlative: iratest
The word 'irater' originates from the Latin 'iratus' (meaning angry) combined with the suffix '-er' (meaning a person who). Thus, 'irater' refers to a person who is angry or expresses anger.
Think of someone who is 'angry' ('iratus') — the '-er' indicates that this person is characterized by that anger.