What was the original location designated for the care of the sick aboard ships called?

The original location designated for the care of the sick aboard ships is referred to as sickbay. Historically, sickbays have served as medical treatment areas on naval vessels where crew members could receive medical care and rest in a dedicated space. Sickbays are crucial for maintaining the health and wellbeing of sailors, allowing for the treatment of illnesses and injuries that may occur at sea.

The term sickbay specifically indicates a location intended for medical purposes, distinguishing it from other areas on a ship, such as the wardroom, which is designated for officers to dine and socialize. The hospital deck typically refers to a more extensive medical facility, rather than the original designated area for sick crew members on ships. Likewise, the captain's quarters are meant for the command and residence of the ship’s captain, not for medical care. Therefore, sickbay is the correct answer as it directly pertains to the historical context of medical care aboard naval vessels.