单词 | retrograde |
释义 | retrograde[ re-truh-greyd ] / ˈrɛ trəˌgreɪd / SEE SYNONYMS FOR retrograde ON THESAURUS.COM adjectiveverb (used without object), ret·ro·grad·ed, ret·ro·grad·ing.verb (used with object), ret·ro·grad·ed, ret·ro·grad·ing.Archaic. to turn back. Origin of retrograde1350–1400; Middle English (adj.) <Latin retrōgradus going back, derivative of retrōgradī, equivalent to retrō-retro- + gradī to step, go; see grade SYNONYMS FOR retrograde1 withdrawing, receding. 2 backward. 7 withdraw, recede, retrocede. SEE SYNONYMS FOR retrograde ON THESAURUS.COM OTHER WORDS FROM retrograderet·ro·grade·ly, adverbret·ro·grad·ing·ly, adverbun·ret·ro·grad·ed, adjectiveun·ret·ro·grad·ing, adjectiveWords nearby retrograderetroflex, retroflexion, retrofocus lens, retrognathism, retrogradation, retrograde, retrograde amnesia, retrograde beat, retrograde block, retrograde ejaculation, retrograde embolism Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for retrogradeBritish Dictionary definitions for retrograderetrograde / (ˈrɛtrəʊˌɡreɪd) / adjectiveverb (intr)to move in a retrograde direction; retrogress US military another word for retreat (def. 1) Derived forms of retrograderetrogradation, nounretrogradely, adverbWord Origin for retrogradeC14: from Latin retrōgradī to go backwards, from gradi to walk, go Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for retrograderetrograde [ rĕt′rə-grād′ ] adj.Moving or tending backward. Opposite to the usual order; inverted or reversed. Reverting to an earlier or inferior condition. v.To move or seem to move backward; recede. To decline to an inferior state; degenerate. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for retrograderetrograde [ rĕt′rə-grād′ ] Having a rotational or orbital movement that is opposite to the movement of most bodies within a celestial system. In the solar system, retrograde bodies are those that rotate or orbit in a clockwise direction (east to west) when viewed from a vantage point above the Earth's north pole. Venus, Uranus, and Pluto have retrograde rotational movements. No planets in the solar system have retrograde orbital movements, but four of Jupiter's moons exhibit such movement. Having a brief, regularly occurring, apparently backward movement in the sky as viewed from Earth against the background of fixed stars. Retrograde movement of the planets is caused by the differing orbital velocities of Earth and the body observed. For example, the outer planets normally appear to drift gradually eastward in the sky in relation to the fixed stars; that is, they appear night after night to fall a little farther behind the neighboring stars in their westward passage across the sky. However, at certain times a particular planet appears briefly to speed up and move westward a bit more quickly than the neighboring stars. This happens as Earth, in its faster inner orbit, overtakes and passes the planet in its slower outer orbit; the appearance of moving counter to its usual eastward drift is thus simply the result of perspective as seen from Earth. Compare prograde. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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