3.
[Etymology]
Old English modor; compare Old Saxon modar, Old High German muotar, Latin mater, Greek meter
n
1.
a stringy slime containing various bacteria that forms on the surface of liquids undergoing acetous fermentation. It can be added to wine, cider, etc to promote vinegar formation mother of vinegar
2.
[Etymology]
C16: perhaps from mother1, but compare Spanish madre scum, Dutch modder dregs, Middle Low German modder decaying object, mudde sludge