Persons examined as witnesses in a cause, who testify in regard to some professional or technical matter arising in the case, and who are permitted to give their opinions as to such matter on account of their special training, skill, or familiarity with it.
An expert is a person who possesses peculiar skill and knowledge upon the subject matter that he is required to give an opinion upon. State v. Phair, 48 Vt. 366.
An expert is a skillful or experienced person; a person having skill or experience, or peculiar knowledge on certain subjects, or in certain professions; a scientific witness. From the Latin experti, which signifies, instructed by experience. Persons who are selected by the courts or the parties in a cause on account of their knowledge or skill, to examine, estimate, and ascertain things, and make a report of their opinions.