Definition of conjugate diameter in US English:

conjugate diameter


  • The distance between the front and rear of the pelvis.

    • ‘A standard method is called the parallelogram method, and is applicable to conjugate diameters as well as to the usual perpendicular axes.’
    • ‘The true conjugate diameter is the anterio-posterior diameter of the pelvic inlet, measured from the superior margin of the symphysis pubis to the sacrovertebral angle.’
    • ‘These calibrated markings 38 can also be used to measure the adequacy of pelvic conjugate diameter during labor.’
    • ‘The pelvic outlet is characterized by the anteroposterior, anterior sagittal, bispinous, and posterior sagittal diameters; and the pelvic inlet by the diagonal conjugate, obstetric conjugate, and true conjugate diameters.’