cardioid
Mathematical term for the heart-shaped curve; used in geometry and related fields.
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.
She baked heart-shaped cookies.
The leaf is heart-shaped.