noun
indoor swimming pool
B1
Noun: das Hallenbad — indoor swimming pool. Usage: enclosed/covered pool for public swimming. Grammar: neuter, plural Hallenbäder (umlaut + er). Genitive singular des Hallenbads. Compound of Hallen + Bad. Common in schedules: 'im Hallenbad geöffnet' or 'ins Hallenbad gehen'. Often contrasted with Freibad (outdoor pool).
Examples
Im Winter gehen wir oft ins Hallenbad schwimmen.
In winter we often go swimming in the indoor pool.
Die Schule organisierte einen Ausflug ins Hallenbad, weil das Wetter schlecht war und die Schüler mehr Bewegung brauchten.
The school organised a trip to the indoor swimming pool because the weather was bad and the pupils needed more exercise.
Wir gehen heute ins Hallenbad.
We're going to the indoor swimming pool today.
Details
Mnemonics
Sounds like 'hall-and-bad' — imagine a big hall with a pool (bad = bath/pool).
das — think of a neutral building: 'the indoor pool' is a building (das).
Notes
Hallenbad refers to an indoor public swimming pool (as opposed to Freibad, an outdoor pool).