diameter /dī-amˈi-tər/

1. The measure through or across
2. A straight line passing through the centre of a circle or other figure, terminated at both ends by the circumference
3. In the parabola, a straight line parallel to the axis extending from the curve to infinity

diamˈētral or diametric /dī-ə-metˈrik/, also diametˈrical adjective

1. In the direction of a diameter
2. Relating to the diameter
3. As of opposite ends of a diameter (as in diametrical opposition)

diamˈetrally adverb

In a diametral manner

diametˈrically adverb

1. Along a diameter
2. As at the ends of a diameter

tactical diameter

The perpendicular distance between a ship's courses before and after turning 180º

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