keel |
| noun
- A large beam along the underside of a ship's hull from bow to stern.
- Sometimes, a rigid, flat piece of material anchored to the lowest part of the hull of a ship to it greater control and stability.
- Something similar to chalk or crayon used to mark pavement.
| | Kepler's laws |
| noun (wikipedia, Kepler's laws of planetary motion )
- (astronomy) the three laws of planetary motion discovered by Kepler in the early 17th century
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