This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Relating to or involving both the colon and the rectum: colorectal cancer.

adj. Of or pertaining to the colorectum

adj. relating to or affecting the colon and the rectum

"Essentially I had left the fanny specialists and gone over to the bum specialists: my new doctor was what was known as a colorectal surgeon."

colorectal cancer   

projectile    rectal   

inoperable    non-small-cell    ovarian    esophageal    well-differentiated    head/neck    colonic    anaplastic    metastatic    medullary