Obolus

Etymology
, from.

Noun

 * 1)  obol coin
 * 2) a small monetary donation
 * 1) a small monetary donation
 * 1) a small monetary donation

Usage notes

 * Several dictionaries, including the University of Leipzig's, the Digitales Wörterbuch der deutschen Sprache, and the Duden, list "Obolus" and "Obolusse" as the only plural forms, though "Obolen" is the most common plural form even in the DWDS corpus. These dictionaries also list "Obolus" as the only genitive; "Obolusses" is also attested, but is rare.
 * In literature, "Obolen" is by far the most common plural, followed by "Obole", followed by the Latinate plural "Oboli" and Greek "Oboloi". The invariant plural "Obolus" and the plural "Obolusse" are rare.
 * The diminutive "Obolchen" is vanishingly rare: