galligu en · NOUN
Etymology
Term used in Widnes (historically part of Lancashire), of unknown origin. Possibly onomatopoeic or sound-symbolic.
Meanings
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(uncountable) The insoluble waste products of the Leblanc process.
Most of what is now south-central Widnes is probably underlain by galligu[…]
1967, Geographical Association, Geography, volumes 51-52:Of the technical improvements in the Leblanc process, some of the most important were concerned with the treatment of galligu to recover sulphur.
1993, Thomas Kingston Derry, Trevor Illtyd Williams, A short history of technology: from the earliest times to A.D. 1900, page 540: