say it: REH-truh-grayd
retrograde is a verb and adjective meaning "move backward in an orbit, of celestial bodies". It carries 9 recorded senses.
get worse or fall back to a previous condition
moving from east to west on the celestial sphere; or--for planets--around the sun in a direction opposite to that of the Earth
astronomy
of amnesia; affecting time immediately preceding trauma
going from better to worse
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for retrograde come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.