stray
noun.
an animal that has strayed (especially a domestic animal)
verb.
move about aimlessly or without any destination, often in search of food or employment
The gypsies roamed the woods|roving vagabonds|the wandering Jew|The cattle roam across the prairie|the laborers drift from one town to the next|They rolled from town to town
verb.
wander from a direct course or at random
The child strayed from the path and her parents lost sight of her|don't drift from the set course
Synonym: drift, err
verb.
lose clarity or turn aside especially from the main subject of attention or course of argument in writing, thinking, or speaking
She always digresses when telling a story|her mind wanders|Don't digress when you give a lecture
adj.
not close together in time
isolated instances of rebellion|a few stray crumbs
Synonym: isolated
adj.
(of an animal) having no home or having wandered away from home
a stray calf|a stray dog