Of or pertaining to the pelvis: as, pelvic bones, those composing the pelvis; pelvic viscera, those contained in the pelvis; the pelvic inlet or outlet; the pelvic cavity; pelvic measurementOf the true pelvis: Anteropos-tirior diameter of the brim. Same as conjugate diameter of the brim. Anteroposterior diameter of the outlet, the distance between the tip of the coccyx and the lower border of the symphysis pubis. Bis-iliac diameter, the transverse diameter of the brim. Bis-ischiatic diameter, the transverse diameter of the outlet. Coccypubal diameter. Same as anteroposterior diameter of the outlet. Conjugate diameter of the brim. (α) In anatomy, the distance between the sacral promontory and the upper margin of the symphysis pubis. (β) In obstetrics, the least distance between the sacral promontory and the symphysis pubis, measured to a point on the symphysis about two fifths of an inch below the upper margin. Conjugate diameter of the cavity, the anteroposterior diameter, measured from the suture between the second and third sacral vertebræ to the middle of the symphysis pubis. Conjugate diameter of the outlet. (α) The distane between the tip of the coccyx and the inferior margin of the symphysis pubis. (β) The distance between the sacrococcygeal articulation and the inferior margin of the symphysis pubis. Diagonal conjugate diameter of the cavity, the distance between the sub-pubic ligament and the sacral promontory, measured in the living. (10) Normal conjugate diameter of the cavity, the anteroposterior diameter between the concavity of the third sacral vertebra and the upper margin of the sumphysis pubis. (11) Oblique diameter of the brim, the distance between the iliopectineal eminence and the sacro-iliac synchondrosis of the opposite side. (12) Oblique diameter of the outlet, the distance from the middle of the great sacrosciatic ligament to the point of union between the opposite rami of pubis and ischium. (13) Sacrocotyloidean diameter, the distance between the sacral promontory and the posterior part of the cotyloidean cavity. (14) Transverse diameter of the brim, the greatest diameter measured from side to side. (15) Transverse diameter of the cavity, the distance between the points of the inner surface of the os innominatum opposite the middle of the acetabula. (16) Transverse diameter of the outlet, the distance between the tuberosities of the ischium. (17) True conjugate diameter of the brim. Same as 6 (β), above.