Dictionaries, Thesauruses, Pictures, and Press Releases
- Hastarian
- hastingsite
- Hatchett, Charles
- Hatch–Slack pathway
- Hatschek, Berthold
- Haug, Gustave Emile
- haulm
- Haumurian
- Haurwitz, Bernhard
- Hautefeuille, Paul Gabriel
- Hauterivian
- Haüy, Abbé René-Just
- Havers, Clopton
- Haversian canal
- Haversian canals
- Hawaiian eruption
- Hawaiian goose
- Hawaiian-Emperor chain
- hawfinches
- hawk eagles