For the purposes of this article:

1. "Hospital" means any institution, place, building or agency, public or private, whether organized for profit or not, devoted primarily to the maintenance and operation of facilities for the diagnosis, treatment or care of patients admitted for overnight stay or longer in order to obtain medical care, surgical care, obstetrical care, or nursing care for illness, disease, injury, infirmity, or deformity. Except as otherwise provided by paragraph 5 of this subsection, places where pregnant females are admitted and receive care incident to pregnancy, abortion or delivery shall be considered to be a "hospital" within the meaning of this article, regardless of the number of patients received or the duration of their stay. The term "hospital" includes general and specialized hospitals, tuberculosis sanitoria, maternity homes, lying-in homes, and homes for unwed mothers in which care is given during delivery.

2. "General hospital" means a hospital maintained for the purpose of providing hospital care in a broad category of illness and injury.

3. "Specialized hospital" means a hospital maintained for the purpose of providing hospital care in a certain category, or categories, of illness and injury.

4. "Related institution" means an institution, or an industrial or other type of infirmary, providing limited medical or surgical care to ill or injured persons on a temporary basis, or a birthing center.