Noun
English Wikipedia has an article on:mother liquorWikipedia
mother liquor (plural mother liquors)
(chemistry) The solution remaining after a component has been removed by processes such as filtration, crystallization, etc..
In the past, crystals were loaded into glass capillaries with the crystallization solution (the mother liquor ). Source: Internet
These crystals grow as sugar from the mother liquor forms around them. Source: Internet
This sugar ("raw") is of lower quality with more colour and impurities, and is the main source of the sugar dissolved again into the mother liquor. Source: Internet