• Webster's Revised Unabridged Dictionary
    • n mopus mō"pŭs A mope; a drone.
    • ***
Century Dictionary and Cyclopedia
    • n mopus A mope; a drone.
    • n mopus Money: usually in the plural.
    • ***
Chambers's Twentieth Century Dictionary
    • n Mopus mop′us (slang) money.
    • ***


In literature:

She had spoken a second time to Mr. Mopus, and Mr. Mopus had asked her whether there existed any family deed as to the diamonds.
"The Eustace Diamonds" by Anthony Trollope
It was Mopus's year, when the Yorkshire Lass ran a dead heat with Skyrocket for the Diddlesworth.
"One Of Them" by Charles James Lever

In poetry:

I confess it hardish lines is
Not to earn a mopus :
Galling ne'er to get a Finis
Coronare Opus.
"The Patrol And The Gold-Digger" by Adam Lindsay Gordon