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a person employed by a state or institution to obtain secret information from rival countries, organizations, companies, etc.



a settlement in Belgium, in Namur Province, near which the fragments of two Neanderthal skeletons were found in a cave in 1886 during archaeological excavations conducted by the Belgian scientists M. Lohest and M. de Puydt. Also found were the bones of a mammoth, a woolly rhinoceros, a cave hyena, and other animals of the Würm, as well as Mousterian stone weapons. On the basis of these finds it was possible for the first time to establish the period during which a specific type of Neanderthal man existed. The people from the Spy cave were characterized by a large brain (1,500–1,600 cc). Anthropologically, they were late Neanderthal men who lived in Western Europe 40,000–50,000 years ago.

References in classic literature ?
The enemy's spies who have come to spy on us must be sought out, tempted with bribes, led away and comfortably housed.
It is through the information brought by the converted spy that we are able to acquire and employ local and inward spies.
It is owing to his information, again, that we can cause the doomed spy to carry false tidings to the enemy.
When he had left the horses and the troops behind him, he made all speed on his way, but Ulysses perceived his coming and said to Diomed, "Diomed, here is some one from the camp; I am not sure whether he is a spy, or whether it is some thief who would plunder the bodies of the dead; let him get a little past us, we can then spring upon him and take him.
Is it to plunder the bodies of the slain, or did Hector send you to spy out what was going on at the ships?
Suppose this brought him into spy circles, and little loans were made to him, and little ties tied on to him.
The Duke, however stimulated, had the instincts of an aristocrat, and desired rather to stare at the house than to spy on it; but Flambeau, who had the instincts of a burglar (and a detective), had already swung himself from the wall into the fork of a straggling tree from which he could crawl quite close to the only illuminated window in the back of the high dark house.
He captured the spy, and as to what then happened, Carlson gave us a fair idea.
It was in Berlin that I met him, where, as an accredited international spy of the Iron Heel, I was received by him and afforded much assistance.
A spy of that sort can afford to be more reckless than the most reckless of conspirators.
That is in a certain shop in Brett Street, and on the lips of a certain secret agent once upon a time the confidential and trusted spy of the late Baron Stott-Wartenheim, Ambassador of a Great Power to the Court of St James.
The spy preserved the same relative distance between them, and followed: with his eye upon her.