The crossword solution for the term 'ODD ___ OUT' is MOM, which is a three letter word. The phrase 'odd one out' is used to describe someone or something that is different from the others in a group. It can be used to refer to a person who stands out from the crowd due to their behavior, appearance, or beliefs. It can also be used to describe an object that does not fit in with the rest of the items in a set.