diameter
UK: daɪˈæmɪtə | US: daɪˈæmɪtər
n. a straight line passing from side to side through the center of a circle or sphere
n. the length of such a line
n. the width or thickness of something circular or cylindrical
The word "diameter" originates from Greek diametros, combining dia ("across") and metron ("measure"). It literally means "measuring across," reflecting the geometric concept of a line spanning the width of a circle through its center. This term was adopted into Latin as diametrus and later into Middle English, retaining its precise mathematical meaning.
The diameter of the circle is exactly 10 centimeters.
To find the area, you need to know the diameter of the pipe.
The tree's trunk has a diameter of over two meters.
The engineer measured the diameter of the wheel carefully.
A larger diameter allows for greater water flow in the pipe.