sentinel

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sentinel

/sen·ti·nel/ (sen´tĭ-n'l) one who gives a warning or indicates danger.

sentinel

a recording mechanism, such as an animal, a farm or a veterinarian, posted explicitly to record a possible occurrence or series of occurrences in a prospective surveillance program.

sentinel loop
a distended loop of small intestine associated with acute pancreatitis; visible in abdominal x-rays.
References in classic literature ?
The ape-man stood so concealed in a clump of bushes that he could watch the interior of the room without being seen from within, while he was at the same time hidden from the view of anyone who might chance to pass along the post of the sentinel he had slain.
The balance of them, with the exception of a single sentinel beside the gate, had re-entered the building from which they had been summoned.
Before doing this, the Sentinel turned to the children, and said "Give me your names.
Then the Sentinel scratched violently at the door, and gave a yell that made Bruno shiver from head to foot.
Obscurity, through which a sentinel glided like a shadow; silence, which permitted him to hear the sound of his own footsteps, accompanied with the jingling of his spurs upon the stone slabs.
transmitted from sentinel to sentinel, preceded the unknown, and disturbed the slumbers of the officer.
Fouquet gained ground, regardless of the cries of the man, who, however, having at last come up with Fouquet, called out to the sentinel of the second gate, "Look out, look out, sentinel
Just as it was drawing to a close, the enjoyment of the feast was interrupted by an alarm from the sentinel at the door.
The sleeping sentinel in the clump of laurel was a young Virginian named Carter Druse.
Picking up the musket, he is about to execute summary justice, as emperors are in the habit of doing, when something in the face of the weary sentinel appears to touch him.
He turned to the sentinel and added in German, "Draw the curtain again; and if the woman persists, put her back into this room with your own hand.
On a rock which overlooked the track, showing out dark and plain against the sky, there stood a solitary sentinel.