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- Hemiodontidae
- hemipelagic sediment
- hemipelagite
- hemipenis
- Hemiphlebiidae
- Hemiprocnidae
- hemlock fir
- hemocyanin
- hemopoesis
- Henckel, Johann Friedrich
- Henderson, Lawrence Joseph
- Henderson, Thomas
- Henderson, Yandell
- Henfrey, Arthur
- Henking, Hermann
- Henle, Friedrich Gustav Jacob
- Hennig, Emil Hans Willi
- Henri, Victor
- Henrichsen, Sophus
- Henrion, Denis or Didier