[f. LOST ppl. a., after foundling.] A person or thing lost.
1872. Raymond, Statist. Mines & Mining, 197. The great lost river which bursts out of the vertical side of the cañon of the Snakea torrent from the solid rock; a foundling rather than a lostling.
1898. C. Benham, Fourth Napoleon, 24. Evidently she spent her existence on the look-out for the lostling.