first aid

WordReference Random House Learner's Dictionary of American English © 2025

ˈfirst ˈaid, n. [uncountable]

1. emergency treatment given to the sick or injured.

first--aid, adj. [before a noun] :

a first-aid worker.

WordReference Random House Unabridged Dictionary of American English © 2025

first′ aid′, 

1. emergency aid or treatment given to someone injured, suddenly ill, etc., before regular medical services arrive or can be reached.

• 1880–85

first′-aid′, adj. 
first′-aid′er, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

first aid noun

1. immediate medical assistance given in an emergency
2. (as modifier): first-aid box
3. (in Barbados) a small shop that sells domestic items after hours