1. noun /ə.streɪ/
a) Animal that has escaped from its owner. A legal term, usually defined in common law, as a wandering animal whose owner is unknown. An animal cannot be an estray when on the range where it was raised, and permitted by its owner to run. A lost animal whose owner is known to the party at hand is not an estray.
b) Stray.
2. verb /ə.streɪ/
To stray.
Wikipedia foundation.