Obesophobia | fear of gaining weight (see list of phobias) |
Obstetrics | study of midwifery (see list of branches of science) |
Oceanography | study of oceans (see list of branches of science) |
Oceanology | study of oceans (see list of branches of science) |
Ochlophobia | fear of crowds or mobs (see list of phobias) |
Ochophobia | fear of vehicles (see list of phobias) |
Octophobia | fear of the figure 8 (see list of phobias) |
Odonatology | study of dragonflies and damselflies (see list of branches of science) |
Odontology | study of teeth (see list of branches of science) |
Odontophobia | fear of teeth or dental surgery (see list of phobias) |
Odynephobia | fear of pain (see list of phobias) |
Odynophobia | fear of pain (see list of phobias) |
Oenology | study of wines (see list of branches of science) |
Oenophobia | fear of wines (see list of phobias) |
Oikology | study of housekeeping (see list of branches of science) |
Oikophobia | fear of home surroundings and household appliances (see list of phobias) |
Olfactology | study of the sense of smell (see list of branches of science) |
Olfactophobia | fear of smells (see list of phobias) |
Ombrology | study of rain (see list of branches of science) |
Ombrophobia | fear of rain or of being rained on (see list of phobias) |
Ommatophobia | fear of eyes (see list of phobias) |
Ommetaphobia | fear of eyes (see list of phobias) |
Omphalophobia | fear of belly buttons (see list of phobias) |
Oncology | study of tumours (see list of branches of science) |
Oneirogmophobia | fear of wet dreams (see list of phobias) |
Oneirology | study of dreams (see list of branches of science) |
Oneirophobia | fear of dreams (see list of phobias) |
Onomasiology | study of nomenclature (see list of branches of science) |
Onomastics | study of proper names (see list of branches of science) |
Onomatophobia | fear of hearing a certain word or of names (see list of phobias) |
Ontology | study of pure being; the nature of things (see list of branches of science) |
Oology | study of eggs (see list of branches of science) |
Ophidiophobia | fear of snakes (see list of phobias) |
Ophiology | study of snakes (see list of branches of science) |
Ophthalmology | study of eye diseases (see list of branches of science) |
Ophthalmophobia | fear of being stared at (see list of phobias) |
Opiophobia | fear of prescribing (opioid) medication to patients (see list of phobias) |
Optics | study of light (see list of branches of science) |
Optology | study of sight (see list of branches of science) |
Optophobia | fear of opening one’s eyes (see list of phobias) |
Orchidology | study of orchids (see list of branches of science) |
Organology (biology) | study of form, structure, development, and functions of plant or animal organs (see list of branches of science) |
Organology (musicology) | study of musical instruments in relation to history, culture, construction, acoustic properties and classification (see list of branches of science) |
Ornithology | study of birds (see list of branches of science) |
Ornithophobia | fear of birds (see list of phobias) |
Orology | study of mountains (see list of branches of science) |
Orthoepy | study of correct pronunciation (see list of branches of science) |
Orthography | study of spelling (see list of branches of science) |
Orthophobia | fear of property (see list of phobias) |
Orthopterology | study of cockroaches (see list of branches of science) |
Oryctology | study of fossils , minerals , and rocks (see list of branches of science) |
Osmics | study of smells (see list of branches of science) |
Osmology | study of smells and olfactory processes (see list of branches of science) |
Osmophobia | fear of smells or odors (see list of phobias) |
Osphresiology | study of the sense of smell (see list of branches of science) |
Osphresiophobia | fear of smells or odors (see list of phobias) |
Osteology | study of bones (see list of branches of science) |
Ostraconophobia | fear of shellfish (see list of phobias) |
Otology | study of the ear (see list of branches of science) |
Otorhinolaryngology | study of ear, nose and throat (see list of branches of science) |
Ouranophobia | fear of heaven (see list of phobias) |
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