-sch

From Middle Dutch -sch.

-sch

1. Archaic form of -s.

• IPA^(key): /ʃ/, [ʃ]

Contraction of -isch.

• -'sch

-sch

1. A suffix attached to names to produce eponymous adjectives: -ean, -ian, 's

   die Boolesche/boolesche Algebra ― Boolean algebra

• Words in -sch inflect like normal adjectives.
• While the name generally remains capitalised with the spelling -'sch, it may alternatively be lowercased without the apostrophe (provided that the adjective is neither nominalised nor part of a fixed term).

• Allensche Regel
• Boolesch, boolesch
• Gaußsch, gaußsch
• Goethesch, goethesch; Göthesch, göthesch
• Grimmsch, grimmsch
• Hitlersch, hitlersch
• Hobbessch, hobbessch
• Lockesch, lockesch
• Luthersch, luthersch
• Mozartsch, mozartsch
• Müllersch
• Newtonsch, newtonsch

Feminine nomilisation of etymology 1. Compare Dutch -se, Low German -sche, -sch.

-sch

1. (dated or regional) A suffix attached to family names and other words identifying families or groups of people, to produce a female form, especially denoting a wife or mother.

   Müller (family name) + -sch → die Müllersche (“Mrs Müller”)

   Nachbar (“neighbour”) + -sch → die Nachbarsche (“the woman next door”, especially “the mother of the neighbour family”)

   Kirchdorf (place name) + -sch → die Kirchdorfsche (“that certain woman from Kirchdorf”, especially “the mother of that certain family living there”)

• Meiersche
• Müllersche
• Nachbarsche

From Old Dutch -isc, from Proto-Germanic *-iskaz.

-sch

1. -ish, -an; Used to form adjectives of origin.

• -sc

• Dutch: -s (older -sch)