The cell is like an immunological sentinel that looks out for dangerous pathogens.
And the leader posted armed sentinels at the fringes of the group.
Paulo Coelho -- The Alchemist
Sometimes the cart would be a tank, as he passed cautiously through rows of armed cling peaches and silent sentinels that looked like boxes of Frosted Flakes.
Sharon M. Draper -- Forged by Fire
Trumpkin and the two boys arrived at the dark little stone archway which led into the inside of the Mound, and two sentinel badgers (the white patches on their cheeks were all Edmund could see of them) leaped up with bared teeth and asked them in snarling voices, "Who goes there?"
C.S. Lewis -- Prince Caspian: The Return to Narnia
The walls of Blackcliff rise around us like impassive sentinels.
Sabaa Tahir -- An Ember in the Ashes
Bleecker was perched on the edge of the porch, a pudgy but proud sentinel—Private Tryhard.
Gillian Flynn -- Gone Girl
Night had fallen over Alicante, and the stars shone down like bright sentinels, making the demon towers, and the water in the canals—half ice now—shimmer.
Cassandra Clare -- City of Heavenly Fire
In the woods, in the bitter cold, on the surface of a boundless sea, whispering her name, entrusting her memory to the wind, to the embrace of the silent sentinel trees and to the care of the faithful stars, her namesake, pure and everlasting, the uncontained universe contained in her: Cassiopeia.
Rick Yancey -- The Infinite Sea
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In the backyard the trees stand sentinel around us, frozen branches like figurines of hollow glass, an inch of a fine white powder piled atop each one.
Pittacus Lore -- I Am Number Four
Nearby, silhouetted like a sentinel against the orange-red flames was another engine, one propeller blade pointed skyward.
Judy Blume -- In the Unlikely Event
Papa rubbed his moustache and looked up at the trees standing like sentinels on the edge of the hollow, listening.
Mildred D. Taylor -- Roll of Thunder, Hear My Cry
Therefore, my heart saluted him when I saw him standing alone, a sentinel waving frantically beneath the stand of oaks beside the school, asking for quiet, for attention, for anything that would let him assume command and control of a situation that he could not control.
Pat Conroy -- The Water is Wide
Deep maroon in color, its plastic front cover sprang up on hinges to form the antenna, standing sentinel over the little tube-and-battery-filled chassis small enough to be balanced easily in the palm of a man’s hand.
William Styron -- Sophie’s Choice
Everyone knows what a Sentinel looks like, because no one wants to meet them.
Victoria Aveyard -- Red Queen
There he was stopped by French cavalry sentinels.
Leo Tolstoy -- War and Peace
The darkness stretched the room into a hall, the big windows rose like a flat colonnade of sentinels.
Ayn Rand -- The Fountainhead
One, aloof, stand sentinel.
William Shakespeare -- A Midsummer Night’s Dream
That dreadful sentinel sent a chill to my heart which I do not think that any burglar could have done.
Arthur Conan Doyle -- The Adventures of Sherlock Holmes
I dare not quit my post, though an unfaithful sentinel, whose sure reward is death and dishonour, when his dreary watch shall come to an end!
Nathaniel Hawthorne -- The Scarlet Letter
The case sometimes stood thus: At every gate through which we were to pass, we saw a watchman—at every ferry a guard—on every bridge a sentinel—and in every wood a patrol.
Frederick Douglass -- The Narrative of the Life of Frederick Douglass
The swinging sentinel was posted, and the sea rushed on.
Charles Dickens -- A Tale of Two Cities
When dawn came, the dragon was sitting atop his bedpost, like an ancient sentinel welcoming the new day.
Christopher Paolini -- Eragon
How, now, my vigilant sentinel, can see anything of those you call the Iroquois, on the main land!
James Fenimore Cooper -- The Last of the Mohicans
This time you will lay your plans more accurately; we shall get out into the gallery you have described; kill the sentinel who guards it, and make our escape.
Alexandre Dumas -- The Count of Monte Cristo
—Posted like silent sentinels all around the town, stand thousands upon thousands of mortal men fixed in ocean reveries.
Herman Melville -- Moby Dick
These two girls had been above an hour in the place, happily employed in visiting an opposite milliner, watching the sentinel on guard, and dressing a salad and cucumber.
Jane Austen -- Pride and Prejudice
The rug, now rolled up for the season, stood in one corner like a sentinel on guard duty.
Stephen King -- The Shining
The ship slid by for what seemed like a mile, a mile of high, black canyon wall, a mile of castle fortification with not a single sentinel to notice us languishing in the moat.
Yann Martel -- Life of Pi
He traversed the line of the principal outposts, halting here and there to talk to the sentinels.
Victor Hugo -- Les Miserables
Yeh th’ derndest sentinel—why—hello, Henry, you here?
Stephen Crane -- The Red Badge of Courage
Lit from beneath by banks of floodlights, the church’s two bell towers rose like stalwart sentinels above the building’s long body.
Dan Brown -- The Da Vinci Code
Keep out of the yard, though, the dogs are unchained; and the house — Juno mounts sentinel there, and — nay, you can only ramble about the steps and passages.
Emily Bronte -- Wuthering Heights
The sworn sentinels of Vatican City.
Dan Brown -- Angels & Demons
I saw Sam and Jared, one on either side of the road like sentinels, as I raced up the road toward Forks.
Stephenie Meyer -- Breaking Dawn
As I went into the drawing-room I glanced back, over my shoulder, and I saw Mrs Danvers still standing there at the head of the stairs, like a black sentinel.
Daphne du Maurier -- Rebecca
Against their depredations, a small black sentinel was stationed on the front porch.
Margaret Mitchell -- Gone with the Wind
I couldn’t see any place where it could fit; the long, flat line of a mesa flanked by blunt peaks on either end, like sentinels.
Stephenie Meyer -- The Host
They told me no one was allowed over the canal, and, looking along the road towards the bridge, I saw one of the Cardigan men standing sentinel there.
H.G. Wells -- The War of the Worlds
Harry’s Patronus stood sentinel before the golden grilles as they shut and the lifts began to rise.
J.K. Rowling -- Harry Potter and the Deathly Hallows
Then, as I drew nearer, he revealed himself as a German shepherd, sleek and black, a silent sentinel guarding the driveway of a big white house.
Robert Cormier -- I Am the Cheese
Another crow joined them and Robert Jordan, watching them, thought: those are my sentinels.
Ernest Hemingway -- For Whom the Bell Tolls
Jo was dismissed, but chose to march up and down the hall like a sentinel, having some fear that the prisoner might bolt.
Louisa May Alcott -- Little Women
Lopsided snowmen would stand sentinel in yards.
David Guterson -- Snow Falling on Cedars
You cannot cross the rivers again, and behind you there are now secret sentinels that you cannot pass.
J.R.R. Tolkien -- The Fellowship of the Ring
But she sat as still as a sentinel, and when Coyotito awakened she placed him on the ground in front of her and watched him wave his arms and kick his feet, and he smiled and gurgled at her until she smiled too.
John Steinbeck -- The Pearl
Soon after, with a drink all round, we lay down to sleep, and the outside of Silver’s vengeance was to put George Merry up for sentinel and threaten him with death if he should prove unfaithful.
Robert Louis Stevenson -- Treasure Island
He was again interred, and a sentinel set over his grave.
Harriet Jacobs -- Incidents in the Life of a Slave Girl
From the outside the buildings were reticent, severe straight lines of red brick or white clapboard, with shutters standing sentinel beside each window, and a few unassuming white cupolas placed here and there on the roofs because they were expected and not pretty, like Pilgrim bonnets.