心しん臓ぞう形けい

noun

cardioid

Mathematical term for the heart-shaped curve; used in geometry and related fields.

• 心しん臓ぞう形けいは、ある円えんの外そと側がわを同おなじ半はん径けいの円えんが滑すべらずに転ころがるときにできる曲きょく線せんです。

  A cardioid is the curve traced by a point on the circumference of a circle rolling around the outside of a fixed circle of the same radius.

noun which may take the genitive case particle 'no'

heart-shaped; cordate

General descriptive term for anything shaped like a heart; often used with の to modify nouns.

• 彼かの女じょは心しん臓ぞう形けいのクッキーを焼やいた。

  She baked heart-shaped cookies.

• その葉はは心しん臓ぞう形けいをしている。

  The leaf is heart-shaped.