• WordNet 3.6
    • n guardrail a railing placed alongside a stairway or road for safety
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Century Dictionary and Cyclopedia
    • n guardrail On a railway-track, an additional rail placed beside the rail in service, either with the object of receiving the wheel in case it should leave the track or of preventing the wheel from leaving the track.
    • n guardrail Nautical, a fore-and-aft timber bolted on the outside of the covering-board or plank-sheer on steam-vessels navigating harbors, lakes, and rivers, to act as a fender when lying alongside of other vessels, or when made fast to a dock. Sometimes a second guardrail is carried along the sides just above the water, and is then called a bilge guard-rail.
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In literature:

No guardrails blocked the descent into the steep gullies.
"The Great Gray Plague" by Raymond F. Jones
The guardrail shielding the town had been bent down and flattened and the chair wheeled over it easily, with hardly a bump.
"Makers" by Cory Doctorow

In poetry:

Insulting, they put guardrails up,
as if it were a crib!
I growl at the head nurse; we compose on one.
I have been operating from nothing,
like a dog after its tail
more slowly, losing altitude.
"Dream Song 54: 'NO VISITORS' I thumb the roller to" by John Berryman

In news:

A motorcyclist was killed when he crashed into a guardrail in the Pinkham Notch area.
A toxicology report further determined Lenihan, 18, of Hamburg had been "huffing" from a can of dust remover and was under the influence of inhalants when her car hit the guardrail.
Traffic along the Indiana Toll Road was backed up earlier today after a Fed-Ex semi crashed into a guardrail.
Ray Allegrezza Editor-in-Chief Wouldn't it be helpful (especially as we scramble to regain our business equilibrium during this post-recession recovery) if we had a set of guardrails that could keep us safely on the road to profitability.
Lt Chris Billiot was in his personal vehicle in the northbound lanes and hit a guardrail near the north end of the bridge shortly after midnight, authorities said.
As you read it, realize there are general standards that apply to all scaffolds (for instance, the use of guardrails), and then specific standards that apply only to different types of scaffolding , such as suspended scaffolds .
In an effort to reduce the Skyway 's impact on the area, the US Forest Service intentionally used weathered guardrails to help the road blend more naturally into the scenery.
Investigators said a woman driving north on Interstate 45 hit the left guardrail at 11 pm Wednesday at Dixie Farm Road.
The bridge, which had been closed for guardrail repairs since January, was scheduled to reopen May 11 but became stuck in the up position and required an additional fix.
But guardrails "can also split a car in two," said Darryl Smith, Town engineer, citing an example about the sometimes tricky nature of implementing traffic calming procedures.
Construction will include grinding the existing pavement , resurfacing, signs, sidewalk and guardrail work, signal light improvements and other items.
A 68-year-old Oxford woman was taken to St Luke's hospital after she fell asleep while driving and hit a guardrail, said State Police at the Washington station.
Or you might hit a patch of oil and lose control and hit a guardrail.
NCUA is setting guardrails along the regulatory road, Hyland says.
Back in July we sorted through an identically titled card that showed lots the Blue Water Bridge's guardrail and precious little scenery .