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Vanguard

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.03 sec.

Vanguard

Any of three unmanned U.S. experimental satellites. Vanguard I (1958), the second U.S. satellite placed in orbit around Earth (after Explorer 1), was a tiny 3.25-lb (1.47-kg) sphere with two radio transmitters. Its flight path revealed that Earth is almost imperceptibly pear-shaped, confirming earlier theories. Vanguard II (1959) carried light-sensitive photocells to provide information about Earth's cloud cover, but its tumbling motion rendered the data unreadable. Vanguard III (1959) was used to map Earth's magnetic field.
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As soon as they come to a place they think convenient to halt at, the officer that commands the vanguard marks out with his pike the place for the King's or viceroy's tent: every one knows his rank, and how much ground he shall take up; so the camp is formed in an instant.
A Voyage to Abyssinia by Lobo, Father View in context
I listened, wondering, As on it crept: at first a gentle sigh, Like as a spirit passing; then it swelled Into the roaring of great waves that smite The broken vanguard of the cliff: the rage Of storm-black tigers in the startled night Among the jackals of the wind and rain.
A Lute of Jade by Cranmer-Byng, L. View in context
The night he received the news, Kutuzov sent Bagration's vanguard, four thousand strong, to the right across the hills from the Krems-Znaim to the Vienna-Znaim road.
War and Peace by Tolstoy, Leo View in context
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