Why is it der Jammer?

Jammer ends in -er, and most nouns ending in -er are masculine: in a German dictionary, 86% of them take der.

All nouns ending in -er
Sense 1
der

Meaning

[1] Expression of wasters

[1] Äußerung von Wehklagen

[2] Condition of suffering, misery

[2] Zustand von Leid, Elend

Examples

[1] Your Jammer was impressive and convincing

[1] Ihr Jammer war beeindruckend und überzeugend.

[2] It is a misery in which condition the house is now

[2] Es ist ein Jammer, in welchem Zustand das Haus nun ist.

Declension

1 Singular Plural
Nominativ der Jammer —
Genitiv des Jammers —
Dativ dem Jammer —
Akkusativ den Jammer —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary