Why is it der Beamer?

Beamer 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] Projector for data from a computer, DVD player, video recorder or the like

[1] Projektor für Daten aus einem Computer, DVD-Player, Videorekorder oder dergleichen

Examples

[1] To present his presentation visually, he used a projector

[1] Um sein Referat visuell zu präsentieren, nutzte er einen Beamer.

Declension

1 Singular Plural
Nominativ der Beamer die Beamer
Genitiv des Beamers der Beamer
Dativ dem Beamer den Beamern
Akkusativ den Beamer die Beamer

Pronunciation

In context

Dictionary entries include material from Wiktionary. Wiktionary