noun, noun which may take the genitive case particle 'no'
cone shape; conical
Refers to the geometric shape of a cone. Often used attributively with の.
パーティー用に円錐形の帽子を買った。
I bought a cone-shaped hat for the party.
この山はきれいな円錐形をしている。
This mountain has a beautiful conical shape.
円錐 is the geometric solid 'cone', while 円錐形 explicitly refers to the shape or form of a cone.
Compound of 円錐 (cone) + 形 (shape).