noun, noun which may take the genitive case particle 'no'
Describes a shape resembling a koban (old Japanese gold coin): a flattened oval or rounded rectangle. Often used attributively with の.
この池は小判型をしている。
This pond is oval-shaped.
小判型のテーブルを買った。
I bought an oval table.
楕円形 is a precise geometric term for ellipse, while 小判型 is a more casual, descriptive term for a koban-coin-like oval shape.
Compound of 小判 (koban, a small oval gold coin from the Edo period) and 型 (type/shape).