responder

noun
re·​spond·​er | \ ri-ˈspän-dər How to pronounce responder (audio) \

Medical Definition of responder

: one that responds (as to treatment or to an antigen)

More from Merriam-Webster on responder

Spanish Central: Translation of responder

Nglish: Translation of responder for Spanish Speakers

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to move or obtain by small maneuvers

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