irà noun /ī.ɾà/
Definitions
  1. swamp, marshland
Etymology
i- (“non-gerundive nominalizer”) + rà (“to decay, to decompose”), literally “That in which decomposition occurs”
Component words
i-non-gerundive nominalizerto decay, to decompose
Source: Wiktionary · etymology 8, where this word is spelled “ira”. Reference: en-ira-yo-noun-48oU-5FX