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- slope stability
- slope stabilization
- slope wash
- slope winds
- slop oil
- slot antenna
- sloth
- slot reader
- slotted line
- Hutchinson, George Evelyn
- Hutchinsonian
- Hutchinson, John
- Hutton, James
- Hutton, James (1726–97)
- Huxley, Hugh Esmor
- Huxley, Sir Andrew Fielding
- Huxley, Sir Julian Sorell
- Huxley, Thomas Henry
- Huxley, Thomas Henry (1825–95)
- Huygenian eyepiece
- Huygens
- Huygens atmospheric structure instrument
- Huygens, Christiaan
- Huygens, Christiaan (1629–95)
- Huygens Gap
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