楕円

1. Origins, structure, and basic meaning

• Structure: 楕円 is read as だえん and is a noun for an ellipse or oval shape.
• Basic usage: Drawing an ellipse appears in 楕円を描く, while describing a stadium as oval appears in 楕円の形.

2. Common pitfalls and similar expressions

• Distinction from 円
  • 楕円 denotes an ellipse or oval shape, whereas 円 denotes a circle whose points are equally distant from the center.