·add. ·- The letters signified by the signal (...---...) prescribed by the International Radiotelegraphic Convention of 1912 for use by ships in distress.
sos, arch. contr. form. 1 For eos; v. is init. — 2 For suos; v. suus init. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.