I. ˌQueen ˈMother noun [singular]
the mother of the ruling king or queen

[TahlilGaran] Dictionary of Contemporary English ▲

II. Queen Mother, the
(1900–2002) the mother of the British Queen Elizabeth II, whose official title was Queen Elizabeth, the Queen Mother. She was one of the most popular and respected members of the royal family, and was thought of as a kind and caring person. She was known to be very interested in horse racing, and she was often called, ‘the Queen Mum’ in British popular newspapers.

[TahlilGaran] Dictionary of Contemporary English ▲

Queen Mother, the
(1900–2002) the mother of the British Queen Elizabeth II, whose official title was Queen Elizabeth, the Queen Mother. She was one of the most popular and respected members of the royal family, and was thought of as a kind and caring person. She was known to be very interested in horse racing, and she was often called, ‘the Queen Mum’ in British popular newspapers.

[TahlilGaran] Dictionary of Contemporary English ▲