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chord
These are chords of a circle. If the chord passes through the centre of the circle it is the longest possible chord, divides the circle into two semicircles and is called a diameter.
That's a 'chord' of a circle. If the chord happens to pass through the center of the circle, then it's called a 'diameter', and no chord of the same circle can be longer.
In general, a "chord", but the particular set of chords that pass through the center are called diameter.
A Chord