Literally, “big land”. The noun tír(“land”) is feminine in modern Irish, so lenition of the adjective mór(“big, great”) is expected and sometimes encountered. The standard form tír mór lacks lenition because tír 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 na tíre móire.[1] It is therefore preferable to consider the phrase feminine but with irregular lack of lenition on the adjective.