| 1. | a person or thing that regulates. |
| 2. | Horology.
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| 3. | Machinery.
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| 4. | Electricity. a device for maintaining a designated characteristic, as voltage or current, at a predetermined value, or for varying it according to a predetermined plan. |
| 5. | a device on scuba equipment for regulating the rate at which compressed air is fed through a breathing tube in proportion to the depth of water. |
| 6. | a device for maintaining a constant gas pressure. |
| 7. | (initial capital letter ) American History.
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reg·u·la·tor (rěg'yə-lā'tər) n.
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| regulator gene n. A gene that causes the production of a protein that regulates or suppresses the activity of one or more structural genes. Also called regulator, regulatory gene. |