Why is it das Endstadium?

Endstadium ends in -ium, and nouns ending in -ium are neuter: in a German dictionary, 100% of them take das.

All nouns ending in -ium
Sense 1
das

Meaning

[1] Last stage, last development section

[1] letztes Stadium, letzter Entwicklungsabschnitt

Examples

[1] "Almost all chronic liver diseases lead to a liver cirrhosis in the final stage"

[1] „Fast alle chronischen Leberkrankheiten führen im Endstadium zu einer Leberzirrhose.“

Declension

1 Singular Plural
Nominativ das Endstadium die Endstadien
Genitiv des Endstadiums der Endstadien
Dativ dem Endstadium den Endstadien
Akkusativ das Endstadium die Endstadien

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary