noun
television, TV set
B1
Fernseher (der) is the television set or TV set — the physical device. It's a masculine, countable noun with plural 'Fernseher' (same form). Declensions: nominative der Fernseher, accusative den Fernseher. Genitive des Fernsehers; dative dem Fernseher; plural dative den Fernsehern. Distinguish from 'Fernsehen' (the medium/activity).
Examples
Wir haben einen neuen Fernseher gekauft.
We bought a new TV set.
Ich habe einen neuen Fernseher.
I have a new television.
Der Nachbar brachte den Fernseher vorbei, weil der alte im Wohnzimmer kaputt war.
The neighbor brought over the television because the old one in the living room was broken.
Details
Mnemonics
Picture a large box with a screen standing in the living room.
fern + seher (seer) — imagine a 'far-seer' that shows images from far away.
der (masculine) — imagine a man (der) proudly standing next to the television.
Notes
Do not confuse 'Fernseher' (the physical TV set) with 'Fernsehen' (the medium/activity).