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Bulk can refer to:
- Bulk fermentation, the period after mixing when dough is left alone to ferment in bulk, meaning before division to final weights.
- Bulk density
- Bulk modulus
- In brane cosmology and M-theory (see also the AdS/CFT correspondence), the bulk is a hypothetical higher-dimensional space within which the eleven dimensions of our universe (the three dimensions we can see, plus time, plus the seven extra dimensions that we can't see but M-theory theorizes are all around us) may exist.
- Mike Waters, known as Bulk, British professional wrestler with the UK Pitbulls
- Bulk and Skull, a pair of characters in the Power Rangers universe