The pelvis is a large, flat bone structure in the lower part of the human body. It forms the base of the spine and supports the weight of the upper body. The pelvic girdle consists of four bones that are fused together at the front and back but separated by an opening in the middle called the pelvic outlet. This opening allows for the passage of the reproductive organs, urinary tract, and nerves.
The pelvis also plays a crucial role in the human reproductive system as it contains the pelvic viscera which includes the bladder, rectum, and female genitalia. In males, the pelvis supports the weight of the upper body and protects the vital organs in the abdominal cavity.
In summary, the word "pelvis" refers to a large bone structure located at the base of the spine that forms part of the human reproductive system and supports the weight of the upper body.