• WordNet 3.6
    • n sentinel a person employed to keep watch for some anticipated event
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Webster's Revised Unabridged Dictionary
    • Sentinel (Zoöl) A marine crab (Podophthalmus vigil) native of the Indian Ocean, remarkable for the great length of its eyestalks; -- called also sentinel crab.
    • Sentinel One who watches or guards; specifically Mil, a soldier set to guard an army, camp, or other place, from surprise, to observe the approach of danger, and give notice of it; a sentry. "The sentinels who paced the ramparts."
    • Sentinel To furnish with a sentinel; to place under the guard of a sentinel or sentinels.
    • Sentinel To watch over like a sentinel. "To sentinel enchanted land."
    • Sentinel Watch; guard. "That princes do keep due sentinel ."
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Century Dictionary and Cyclopedia
    • n sentinel Watch or guard kept by a soldier stationed for the purpose at a particular place.
    • n sentinel A soldier stationed as a guard, either to challenge persons drawing near and to allow to pass only those who give a watchword, and, in the absence of this, to resist them and give an alarm, or for display or ceremony only.
    • n sentinel A sentinel-crab.
    • sentinel Acting as a sentinel; watching.
    • sentinel To watch over as a sentinel.
    • sentinel To furnish with a sentinel or sentinels; place under the guard of sentinels.
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Chambers's Twentieth Century Dictionary
    • n Sentinel sen′ti-nel a soldier or soldier-marine at a point with the duty of watching for the approach of an enemy, or guarding the gun-park, camp, magazine, or other locality: a sentry
    • adj Sentinel acting as a sentinel
    • v.t Sentinel to watch over, as a sentinel
    • ***


  • Johann Kaspar Lavater
    “Conscience is the sentinel of virtue.”
  • Henry Wadsworth Longfellow
    “Critics are sentinels in the grand army of letters, stationed at the corners of newspapers and reviews, to challenge every new author.”
  • Marcus T. Cicero
    “The eyes like sentinel occupy the highest place in the body.”
  • Charles Baudelaire
    “The man who says his evening prayer is a captain posting his sentinels. He can sleep.”
  • Daniel Webster
    “We have been taught to regard a representative of the people as a sentinel on the watch-tower of liberty.”


Webster's Revised Unabridged Dictionary
F. sentinelle,cf. It. sentinella,); probably originally, a litle path, the sentinel's beat, and a dim. of a word meaning, path; cf. F. sente, path. L. semita,; and OF. sentine, sentele, senteret, diminutive words. Cf. Sentry


In literature:

The big cuirassier sentinel had been joined by two more, all of the Hundred-Guards.
"Lorraine" by Robert W. Chambers
Herbert immediately went to the tent in question, where he found two sentinels, with loaded muskets, on duty before the door.
"Capitola's Peril" by Mrs. E.D.E.N. Southworth
This ravine branched into two lesser ones, including within their angle the Arab camp, as also the sentinels stationed to guard it.
"The Boy Slaves" by Mayne Reid
A slight noise draws the sentinel from the hollow, when it is immediately shot down or transfixed by a spear.
"The Western World" by W.H.G. Kingston
He was surrounded by an army of sentinels.
"The Eyes of the Woods" by Joseph A. Altsheler
And the sentinel on our right is doing just the same.
"The Wonders of the Jungle" by Prince Sarath Ghosh
Many causes combined to render the new sentinel sufficiently uncomfortable.
"The Tiger Hunter" by Mayne Reid
Harry saw him raise his eyes and look once at the sentinel palms.
"A Voyage with Captain Dynamite" by Charles Edward Rich
The others slept peacefully, and the two sentinels could hear their easy breathing only a few feet away.
"The Border Watch" by Joseph A. Altsheler
At the door of the great bark lodge where the chiefs met, sentinels were posted to prevent interruption.
"Four American Indians" by Edson L. Whitney

In poetry:

Rest, comrades, rest and sleep!
The thoughts of men shall be
As sentinels to keep
Your rest from danger free.
"In The Harbour: Decoration Day" by Henry Wadsworth Longfellow
When falls the soldier brave,
Dead at the feet of wrong,
The poet sings and guards his grave
With sentinels of song.
"Sentinel Songs" by Abram Joseph Ryan
The birds in the rustling branches
Sing gayly overhead;
Gray stones like sentinel spectres
Are guarding the silent dead.
"In A Graveyard" by John Hay
"But now—we stand like sentinels
Within the waning night,
To seal with blood the law that gives
Our kindred wider right.
"Cameron's Stone" by Alexander Anderson
Tis a cheerless, lonesome evening
When the soaking, sodden ground
Will not echo to the footfall
of the sentinel's dull round.
"A Rainy Day in Camp" by Anonymous Americas
'This will be, Wyandot brave,
You'll give to me a grave,
In dimness of the forest, in earth my mother's breast,
Each tall tree a sentinel,
Will guard the secret well
Of where you laid Tecumthe down to his lasting rest'
"Tecumthe" by Nora Pembroke

In news:

Journal Sentinel sportswriter Gary D'Amato, who is covering his eighth Olympic Games, offers observations from beyond the playing fields in London.
(Photo by Wade Payne, Special to the News Sentinel).
According to a report from the Orlando Sentinel, a 69-year-old Florida man was arrested last week for allegedly fondling a female nurse who was caring for him at a Florida hospital.
I want to subscribe to The Daily Sentinel &
Susan Jacobson, Orlando Sentinel January 25, 2012.
Special to the News Sentinel This glass vase is by Dominick Labino.
(Fred Brown/Special to the News Sentinel).
Editor's note: The McPherson Sentinel is proud to introduce its newest local columnist, Daniel Schwindt of McPherson.
Wayne Waters Special to the News Sentinel.
Bedard and Tom Silverstein of the Journal Sentinel.
( Tom Benitez, Orlando Sentinel / December 19, 2011 ).
Babe Ruth played (poker) here: The iconic lighthouse stands sentinel along the lake.
Sentinel harrier tops state's leading runners.
Gary W Green, Orlando Sentinel.
(George Skene, Orlando Sentinel / May 06, 2012).

In science:

This research is supported by the research program Sentinels ( as project ’Identity Management on Mobile Devices’ (10522).
The Identity Crisis. Security, Privacy and Usability Issues in Identity Management
Sentinels is being financed by Technology Foundation STW, the Netherlands Organization for Scientific Research (NWO), and the Dutch Ministry of Economic Affairs.
The Identity Crisis. Security, Privacy and Usability Issues in Identity Management
The line ! VAR result‘i’ is a sentinel for the awk script that postprocesses the output: if the format is set to produce Fortran code, FORM breaks each expression into chunks which are separated by the indicator “ = ”, where the underscores need to be replaced by the variable name.
Automated Evaluation of One-Loop Six-Point Processes for the LHC