ngãi lới

Etymology
While was common, the reading  for  was very rare; in fact, this seems to be the only compound where lới occurred (unless the element in  is the same).

This word is attested as ngãi lới in the Dictionarium anamitico-latinum (both in the 1772 manuscript and the 1838 version) and as ngải lới in Như Tây nhựt trình (1889). It is completely obsolete, being replaced by the Northern.