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1. Oxford American Dictionary

   cardioid

   • IPA[ˈkärdēˌoid]

   美式

   • n.
     a heart-shaped curve traced by a point on the circumference of a circle as it rolls around another identical circle.；a directional microphone with a pattern of sensitivity of this shape.
   • adj.
     of the shape of a cardioid.

   • noun: cardioid, plural noun: cardioids

2. • 釋義

   n.

   名詞

   • 1. a heart-shaped curve traced by a point on the circumference of a circle as it rolls around another identical circle.
   • ▪ a directional microphone with a pattern of sensitivity of this shape.

   adj.

   形容詞

   • 1. of the shape of a cardioid.