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mother2 a stringy, slimy substance that grows on the surface of fermenting liquids and is used to change wine or cider into vinegar; mother of vinegar.
motherboard the main printed circuit board of a personal computer, which holds chips containing the central processing unit, memory, ports, and the integrated circuits that control the keyboard and other standard peripheral devices, and to which additional circuit boards can be attached.
Mother Carey's chicken any of various small marine birds, esp. the storm petrel.
mother country one's native land.
motherfucker (vulgar slang) a person or thing considered to be unpleasant, despicable, frustrating, or the like.
Mother Goose the imaginary author of a collection of eighteenth-century English nursery rhymes.
motherhood the state of being a female parent. [2 definitions]
Mother Hubbard a character in an eighteenth-century English nursery rhyme. [2 definitions]
Mothering Sunday (chiefly British) a holiday honoring mothers; Mother's Day.
mother-in-law the mother of a person's husband or wife.
motherland one's native or ancestral country.
mother lode the largest or richest vein of ore in a particular region.
motherly of, characteristic of, befitting, or like a mother. [2 definitions]
Mother Nature a personification of the force or principle that seems to regulate the physical universe.
mother-of-pearl the glossy hard iridescent substance that forms the inner surface of some shells and is commonly used in jewelry and inlaid decoration.
mother of vinegar see mother2.
Mother's Day a holiday to honor mothers, observed in the US, Canada, and the UK on the second Sunday in May.
mother superior (often caps.) the head of a Christian religious order for women.
mother tongue one's first or native language. [2 definitions]
mother wit inborn or natural intelligence or common sense.
motherwort any of a variety of weedy plants of the mint family that bear clusters of small pink or purple flowers.