Question

define of neurosurgeon, paediatrician, dermatologist and cardiologist

Answer 1

Pediatrics is the branch of medicine that involves the medical care of infants, children, and adolescents.Neurosurgery, or neurological surgery, is the medical specialty concerned with the prevention, diagnosis, surgical treatment, and rehabilitation of disorders which affect any portion of the nervous ...  Dermatology is the branch of medicine dealing with the skin, nails, hair and its diseases. It is a specialty with both medical and surgical aspects. Cardiology is a branch of medicine dealing with disorders of the heart as well as parts of the circulatory system.  hope this will help 

Answer 2

here is answer mate
neurosurgeon- a surgeon who specialized in surgery of nervous system and cure nervous disorders.
paediatrician- they are specializing in children disease.
dermatologist- they are skin specialist they cure skin related diseases.
cardiologist- they are heart specialist and cure cardiac related diseases.