Other forms: castaways
A castaway is a shipwreck survivor stranded on a lonely shore. A lone castaway, rescue the castaway, castaways on the island.
The word implies being thrown ashore rather than choosing to stay, which is what separates it from a hermit. It is fixed in English by Robinson Crusoe and by the radio programme that asks guests which records they would take. Note cast away, written as two words for the verb.
1nouncastawayA shipwreck survivor stranded on a shore.
“The castaway lived on coconuts and fish until a passing ship rescued him.”
castaway is a survivor.
Deverbal from cast away.
Etymology from Wiktionary, CC BY-SA