quadrant

one quarter of an area. For example, the liver is in the right upper quadrant of the abdomen

quadraplegia (tetraplegia)

paralysis of all four limbs (arms and legs)

qualified

capable, skilled, trained

quarantine

isolate, keep away from others

used to separate and restrict the movement of people; it is a 'state of enforced isolation'. This is often used in connection to disease and illness, such as those who may possibly have been exposed to a communicable disease