mutuum
/ˈmjuːtjʊəm/ /ˈmjuːtʃʊəm/Roman Law and Scottish Law. Now historical
noun
A contract for the loan of a commodity which will be consumed or used up by the borrower and is therefore to be returned in kind; a loan of this sort.
Origin
Late 15th century. From classical Latin mūtuum loan, use as noun of neuter singular of mūtuus borrowed.