multimammate rat

noun
mul·​ti·​mam·​mate rat | \-ˈmam-ˌāt-\

Medical Definition of multimammate rat 

: any of several common African rodents of the genus Mastomys that have 12 rather than the usual five or six mammae on each side, are vectors of disease (as Lassa fever), and are used in medical research

called also multimammate mouse

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