Obstetrics |
Study of midwifery |
Oceanography |
Study of oceans |
Oceanology |
Study of oceans |
Odology |
Science of the hypothetical mystical force of od |
Odontology |
Study of teeth |
Oenology |
Study of wines |
Oikology |
Science of housekeeping |
Olfactology |
Study of the sense of smell |
Ombrology |
Study of rain |
Oncology |
Study of tumours |
Oneirology |
Study of dreams |
Onomasiology |
Study of nomenclature |
Onomastics |
Study of proper names |
Ontology |
Science of pure being; the nature of things |
Oology |
Study of eggs |
Ophiology |
Study of snakes |
Ophthalmology |
Study of eye diseases |
Optics |
Study of light |
Optology |
Study of sight |
Optometry |
Science of examining the eyes |
Orchidology |
Study of orchids |
Ornithology |
Study of birds |
Orology |
Study of mountains |
Orthoepy |
Study of correct pronunciation |
Orthography |
Study of spelling |
Orthopterology |
Study of cockroaches |
Oryctology |
Mineralogy or paleontology |
Osmics |
Scientific study of smells |
Osmology |
Study of smells and olfactory processes |
Osphresiology |
Study of the sense of smell |
Osteology |
Study of bones |
Otology |
Study of the ear |
Otorhinolaryngology |
Study of ear, nose and throat |