1. 
   Slave unit
   A light sensitive trigger device used to synch strobes and flashes without an electronic synch cord. Accessory flash 'slave' units are available to fire multiple flash units without multiple electrical connections to the camera. These units sense the light output of the first flash, which is mounted...
   Found op http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
   
   
2. 
   Slave unit
   A light sensitive trigger device used to synch strobes and flashes without an electronic synch cord
   Found op http://www.digitalexposure.ca/sub1.html
   
   

Tip: double click on a word to show its meaning.