Dictionaries, Thesauruses, Pictures, and Press Releases
- Olufsen, Christian Friis Rottbøll
- Olympiodorus
- Olympiodorus of Alexandria
- Olympiodorus of Thebes
- Omalius D’halloy, Jean Baptiste Julien D
- omasum
- omasum
- ombrogenous bog
- ombrogenous peat
- ombrotrophic
- Omori, Fusakichi
- omphacite
- Omphalina
- Onagraceae
- oncoid
- oncolite
- oncolith
- oncotic pressure
- Ondatra zibethicus
- one gene–one polypeptide hypothesis