اجر

مُؤْجِرٌ ذ One who lets on hire [a slave, or] a house: one should not say ↓ مُوَاجِرٌ; for this is wrong with respect to the classical language, and abominable with respect to the conventional acceptation and common usage; a foul reproach being meant thereby [as is shown by the explanation of اآجَرَتْ, given above: or, accord to some, it is allowable when it relates to a house: (see أَجَرَهُ:) it seems to be disallowed only when used absolutely]. (A, Mgh.)