Glossary · Fermentation
Gyle
Definition
A single batch of fermenting liquid, and by extension the batch number identifying it. Borrowed from brewing, it is used in larger cider houses as the unit of traceability from tank to pack.
- Subject
- Fermentation
In more detail
The word arrives in cider from brewing, where a gyle is the contents of one fermenting vessel and, by extension, the number written on the tank and carried forward on every document that follows. In a cider house of any size that number is the spine of traceability: it links a pack date back through blending, maturation and fermentation to the pressing and, in a well-run cellar, to the fruit intake.
It matters for two things that are not obvious. A recall has to be scoped, and a batch number is what decides whether a problem means withdrawing four pallets or four thousand. And a blend is an accounting problem as much as a sensory one — a finished tank that draws on six gyles inherits the traceability of all six, which is why blending records are kept at the same standard as fermentation records.
Related terms
Terms that belong to the same part of the subject, or that this one is routinely confused with.
Cider
Blend
A cider or perry made by combining juices or finished batches, either by mixing fruit before milling or by assembling separately fermented lots to a target balance.
Fermentation
Maturation
The period after fermentation in which a cider settles, clarifies and changes chemically — esters forming and hydrolysing, phenolics polymerising, harsh notes integrating — before it is packaged or drunk.
Law and labelling
Best before
A quality date indicating how long a product remains at its best under stated storage conditions. It is not a safety date, and drinks above a certain strength are exempt from requiring one.
Where to go next
- Cider glossary — The whole vocabulary, by subject and A–Z.
- Comparisons — Terms that are only really clear when set against the thing they are not.
- Search — Finds terms by their aliases and by their spellings in other languages.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
Cider and perry production technical training material
Peter Mitchell / Cider and Perry Academy · reference work · registered as competent for this subject
Searched again on 2026-08-25 and it remains the one printed source here that a bibliographic check cannot fix, because it is not a published work with an edition. It is course material issued to participants of a training programme, so there is no catalogue record to verify, no ISBN, and no lawful public copy. Its state stays `registered` for that reason rather than through inattention.
National Association of Cider Makers
NACM · specialist organisation · retrieved 2026-08-24
The UK trade association. Useful for industry-agreed definitions and for the voluntary labelling standards its members work to. A trade body has an interest in how its product is described, so CiderHQ cites it for what the industry says about itself rather than for neutral scientific claims.