1. Nutrients :- Chemical substances taken as food which are necessary for various function, growth and health of living.
2. Nanotechnology:- The study ‘science of small’ is known as nanotechnology.
3. Neurology:- Study of nervous system.
4. Neonatology:- Study of new born.
5. Nephrology:- Study of kidneys.
6. Osmosis:- Movement of water molecule across semi-permeable membrane from the region of its higher concentration to low concentrations .
7. Odontology:- Study of teeth and gum.
8. Osteology:- Study of bones.
9. Oncology:- Study of cancer and tumours.
10. Obstetrics:- Science related with care of pregnant women before,during and after child birth.
11. Ornithology:- Study of birds.
12. Ophthalmology:- Study of eyes.
13. Orthopaedics:- Diagnosis and repair of disorder of locomotery system.
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