a person or thing that adapts any device for connecting two parts, esp ones that are of different sizes or have different mating fitments a plug used to connect an electrical device to a mains supply when they have different types of terminals a device used to connect several electrical appliances to a single mains socket
Collins Concise English Dictionary © HarperCollins Publishers::
'adaptor' also found in these entries (note: many are not synonyms or translations):