Where does the word “Ait” come from and What does Ait mean?

If it were not for the needs of crossword puzzlers, ait is rarely used word that might peacefully fade away from American dictionaries.

In England, where it is still applied occasionally as a term of ancient lineage for a small island, especially in the Thames river, the spelling may be ait, eyot, or eyet, according to one’s whim, each having the same pronunciation as “eight.”