Question

which word part means \anus and rectum\? proct/o rect/o col/o an/o

Explanation:

• proct/o: In medical terminology, this root word specifically refers to the anus and rectum. For example, "proctology" is the study of the anus and rectum.
• rect/o: This root word mainly refers to the rectum. It doesn't cover the anus as comprehensively as "proct/o" when it comes to the combined "anus and rectum" meaning.
• col/o: This root word refers to the colon. It has no relation to the anus and rectum.
• an/o: This root word refers to the anus. It doesn't include the rectum as part of its meaning when considering the combined "anus and rectum" context.

Answer:

proct/o