Skip to search.
Reference
Dictionary
Encyclopedia
Thesaurus
World Factbook

 
Search Dictionary:

Houghton Mifflin

SOS  audio  (s-s) KEY 

NOUN:
  1. The letters represented by the Morse Code signal · · · - - - · · ·, used as an international distress signal, especially by ships and aircraft.
  2. A call or signal for help.



Visit our partner's site
Provided by Houghton Mifflin
logoeReference -- Download this interactive reference software to your desktop computer