tír mór

Etymology
lit. 'big land'. The noun is feminine in modern Irish, so lenition of the adjective  is expected and sometimes encountered. The standard form lacks lenition because  was originally neuter, and adjectives are not lenited after neuter nouns. The lack of lenition has led Ó Dónaill’s dictionary to assign masculine gender to this phrase, but the only attested genitive is the unambiguously feminine. It is therefore preferable to consider the phrase feminine but with irregular lack of lenition on the adjective.

Noun

 * 1) mainland