411 REFERENCE · Wiktionary
Geschwist
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
German
Etymology
de Geschwister n-p, in which de -er is part of the stem, but is reinterpreted here as a plural ending.
Noun
n,(e)s,er
de rare informal chiefly jocular sibling
Declension
n,(e)s,er