stray

Etymology 1

From Middle English stray, strey, from Anglo-Norman estray, stray, Old French estrai, from the verb (see below).

noun

1. Any domestic animal that has no enclosure nor proper place and company, but that instead wanders at large or is lost; an estray.
2. One who is lost, literally or figuratively.
3. An act of wandering off or going astray.
4. (historical) An area of common land for use by domestic animals generally.
5. (radio) An instance of atmospheric interference.
   This invention relates broadly to radio communication, but more particularly to a radio receiving system used for the reception of high frequency current signals wherever they are subject to interference from "static" or strays of an untuned or aperiodic character. 1926, Popular Radio, volume 9, page 191
   Because of their shortness, such signals are usually easy to distinguish from the bomb returns but, when such a stray is recorded just before the bomb return, too close to be distinguished by ear […] 1942, John C. Mathisson, Radio Acoustic Ranging, page 652
   Electromagnetic interference EMI, radio interference RI, television interference TVI, and radio frequency interference RFI, can all be described as a confusion to received radio signals due to strays and undesirable signals. 1976, IEEE Power Engineering Society, Nuclear Power: Health, Safety, Waste Disposal, page 20

Etymology 2

From Middle English strayen, partly from Old French estraier, from Vulgar Latin via strata, and partly from Middle English strien, streyen, streyȝen (“to spread, scatter”), from Old English strēġan (“to strew”).

verb

1. (intransitive) To wander, as from a direct course; to deviate, or go out of the way.
   Thames among the wanton valleys strays. 1642, John Denham, Cooper's Hill
2. (intransitive) To wander from company or outside proper limits; to rove or roam at large; to go astray.
3. (intransitive) To wander from the path of duty or rectitude; to err.
   November 2 2014, Daniel Taylor, "Sergio Agüero strike wins derby for Manchester City against 10-man United," guardian.co.uk It was a derby that left Manchester United a long way back in Manchester City’s wing-mirrors and, in the worst moments, straying dangerously close to being their own worst enemy.
4. (transitive) To cause to stray; lead astray.
   To ease myself I was compelled to leave my basket behind me, trusting to return and find it, if I should ever reach safety and discover on what pathless hill I had been strayed. 1899, John Buchan, No Man's Land

Etymology 3

From Middle English stray, from the noun (see above).

adj

1. Having gone astray; strayed; wandering
   The alley is full of stray cats rummaging through the garbage.
   The organisation fills many gaps left by the state, operating a dizzying array of services, including homes for victims of domestic violence, food banks and a shelter for stray animals. April 6, 2017, Samira Shackle, “On the frontline with Karachi’s ambulance drivers”, in the Guardian
2. In the wrong place; misplaced.
   a stray comma
   a stray bullet