a word, phrase, grammatical construction, or other feature originating in or peculiar to the Irish language
2.
an Irish custom, belief, etc.
Irishism in American English
(ˈairɪˌʃɪzəm)
noun
a custom, manner, practice, idiom, etc., characteristic of the Irish
Also: Iricism
Word origin
[1725–35; irish + -ism]This word is first recorded in the period 1725–35. Other words that entered Englishat around the same time include: arcade, hairline, pantheism, postmortem, snowflake-ism is a suffix appearing in loanwords from Greek, where it was used to form action nounsfrom verbs (baptism). On this model, -ism is used as a productive suffix in the formation of nouns denoting action or practice,state or condition, principles, doctrines, a usage or characteristic, devotion oradherence, etc. (criticism; barbarism; Darwinism; despotism; plagiarism; realism; witticism; intellectualism)