(Mathematics)a heart-shaped curve traced by a point on the circumference of a circle as it rolls around another identical circle (数)心脏线 ■(亦作 cardioid microphone)a directional microphone with a pattern of sensitivity of this shape 心脏形传声器
adjective
of the shape of a cardioid 具心脏形状的
语源
mid 18th cent.: from Greek kardioeidēs 'heart-shaped', from kardia 'heart' + eidos 'form'