waif

Short definition from Wiktionary

Noun

1. 1
   An article of movable property which has been found, and of which the owner is not known, such as goods washed up on a beach or thrown away by an absconding thief; such items belong to the Crown, which may grant the right of ownership to them to a lord of a manor.
2. 2
   Something found, especially if without an owner; something which comes along, as it were, by chance.
3. 3
   A person (especially a child) who is homeless and without means of support; also, a person excluded from society; an outcast.
4. 4
   A very thin person.
5. 5
   A plant introduced in a place outside its native range but not persistently naturalized.
6. 6
   A small flag used as a signal.
7. 7
   Something (such as clouds or smoke) carried aloft by the wind.
8. 8
   A minor celebrity who does not deserve his or her fame.

Verb

1. 1
   To cast aside or reject, and thus make a waif.