noun which may take the genitive case particle 'no'
semicircular; half-round
Describes a shape that is half of a circle; used as a no-adjective before nouns.
半円形の窓がついた部屋に住みたい。
I want to live in a room with a semicircular window.
この公園には半円形のベンチがいくつかある。
There are several semicircular benches in this park.