Mother is an English word, not an acronym. It is a noun which specifies a woman who is in relation to a child, to whom she has given birth. As we already state that it is not an acronym so it does not have any full form but many people create their own full form to show their creativity, love and respect for mother.
“Be a mother who is committed to loving her children into standing on higher ground than the environment surrounding them. Mothers are endowed with a love that is unlike any other love on the face of the earth.” MP Hinckley. A mother's love is like nothing else in the world.
"We are born of love; Love is our mother." "Mother is the name for God in the lips and hearts of little children." "When you look into your mother's eyes, you know that is the purest love you can find on this earth." "A mother is she who can take the place of all others but whose place no one else can take."
Good one