A deserted or abandoned child of unknown parentage.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "foundling" in a sentence
"You see, sir, I'm a poor foundling from the Belfast Asylum, shoved out by the mother that bore me, upon the wide wurld, long before I knew that I was in it."
"So they call the foundling "Mary Rose" and make a solemn oath to stick together and make a good life "for the roses"."
"Their foundling was the rightful King of Birnam-and small wonder there were assassins seeking him."