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/ˈɹəʊdˌɹʌnə/ · noun
Either of two species of fast-running bird in the genus Geococcyx of the cuckoo family native to North and Central America, the lesser roadrunner (Geococcyx velox) and, especially, the greater roadrunner (Geococcyx californianus)..
Use road runner when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Road runner means Either of two species of fast-running bird in the genus Geococcyx of the cuckoo family native to North and Central America, the lesser roadrunner (Geococcyx velox) and, especially, the greater roadrunner (Geococcyx californianus)..
Common synonyms include chaparral bird, chaparral cock, chaparral hen, paisano.
The opposite depends on the specific sense.
Use road runner where its definition matches the intended context.
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