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something considered the greatest or most definitive of its kind; epitome
The Oxford English Dictionary is the mother of all dictionaries.
mother moth·er (mŭð'ər)
A woman who conceives, gives birth to, or raises and nurtures a child.
A female parent of an animal.
A structure, such as a mother cell, from which other similar bodies are formed.
: Every mother other one of 'em cried foulnoun
[both black senses fr the very useful and general motherfucker]