Real Dictionary

nurse
A nurse is a person whose job is to care for people who are ill.
verb: If you nurse an illness or injury, you allow it to get better by resting as much as possible.
verb: If you nurse someone, you care for them when they are ill.

nurse in American English
a person formally educated and trained in the care of the sick or infirm
to give milk from the breast to (an infant); suckle
wet nurse
intransitive verb: to suckle a child, esp. one's own
transitive verb: to tend or minister to in sickness, infirmity, etc

nurse in British English
to tend (a sick person or sick people)
noun: a person who tends sick, injured, or infirm people
noun: Sir Paul (Maxime). born 1949, English cell biologist and geneticist; winner (2001), with LH Hartwell and RT Hunt, of the Nobel Prize for Physiology or Medicine