noun
lawn, turf
B1
Rasen is a masculine noun meaning 'lawn' or 'turf'. It denotes grass areas like a garden lawn. Plural is Rasen (same form), genitive des Rasens. Do not confuse with the verb 'rasen' (to speed). No specific preposition required; used with auf dem Rasen for 'on the lawn'.
Examples
Nachdem der Gärtner den Rasen mähte, bemerkte die Familie, dass der Garten ordentlicher wirkte.
After the gardener mowed the lawn, the family noticed that the garden looked neater.
Das Betreten des Rasens ist verboten.
Walking on the lawn is forbidden.
Der Rasen im Park ist gut gepflegt.
The turf in the park is well maintained.
Details
Mnemonics
Imagine a green carpet (the lawn) stretched across a yard: that's the Rasen.
Sounds like 'razor' but with an 'n' — think of a lawn trimmed by a razor (mower).
der -> picture a big masculine mower labeled 'der' cutting the lawn
Notes
Rasen refers to an area of grass (a lawn). As a count noun it is often used without a plural or with the same form in plural contexts.