Life-preserver

• (n.) An apparatus, made in very various forms, and of various materials, for saving one from drowning by buoying up the body while in the water.
Found on http://thinkexist.com/dictionary/meaning/life-preserver/

Life-preserver

Life'-pre┬Ěserv`er (līf'pre*zẽrv`ẽr) noun An apparatus, made in very various forms, and of various materials, for saving one from drowning by buoying up the body while in the water. -- Life'-pre*serv`ing , adjective
Found on http://www.encyclo.co.uk/webster/L/39

Life-Preserver

Life-preserver is American slang for a ring doughnut.
Found on http://www.probertencyclopaedia.com/browse/ZL.HTM
No exact match found